Your Weak Ties Are Your Best Opportunities: A Data-Backed Guide to Working Your LinkedIn Network

Most people treat their LinkedIn network as two groups: the 30 people they actually talk to, and "everyone else." The research says the opportunities sit mostly in that second group, but not evenly. Some of "everyone else" is gold, and some is noise. This guide is about telling them apart and doing something about it every week.

If you are looking for the exact words to send someone after years of silence, we have a separate guide on how to reconnect with old LinkedIn connections. This one is about the bigger picture: who to pick, when, how often, and how it ties into what you post.

What the research actually found

The 1973 idea

The idea that loose acquaintances matter more than you think goes back to "a highly influential 1973 paper by Stanford sociologist Mark Granovetter, 'The Strength of Weak Ties,'" as MIT News put it (MIT News, Sept 15, 2022). The logic: your close friends know the same people and hear the same news you do. Acquaintances move in other circles, so they hear about things you would never hear about.

The 2022 LinkedIn experiment

For 50 years that idea was mostly tested with surveys. Then researchers from LinkedIn, MIT, Harvard and Stanford ran an actual experiment. LinkedIn varied its "People You May Know" suggestions so that some users were shown more strong-tie suggestions and others more weak-tie suggestions, then watched what happened.

The scale: "around 20 million LinkedIn users, who over the five years ended up creating about 2 billion new connections on the site, recorded over 70 million job applications, and wound up accepting 600,000 new jobs identified through the site" (MIT News). MIT called it "by far the largest longitudinal, randomized controlled experiment on the strength of weak ties ever conducted." The paper, "A Causal Test of the Strength of Weak Ties," appeared in Science.

Three findings matter for you:

1. Moderately weak ties win. "Moderately weak ties are the best," co-author Sinan Aral told MIT News. "Not the weakest, but slightly stronger than the weakest."
2. There is a rough sweet spot. "The inflection point is around 10 mutual connections between people; if you share more than that with someone on LinkedIn, the usefulness of your connection to the other person, in job-hunting terms, diminishes."
3. It depends on your industry. "Weak ties are better in more digital industries," such as software, AI and work that can be done remotely. In more analog industries, strong ties held up better. The researchers say more work is needed on why.

A fair caveat: the study measured job moves, not sales, fundraising or partnerships. It is reasonable to think the same mechanism (new information comes from people outside your usual circle) applies to those too, but that part is our reading, not the paper's finding.

Dormant ties: the part of your network you forgot about

A weak tie is someone you barely know. A dormant tie is different: someone you used to know, sometimes well, but have not spoken to in years. Most LinkedIn networks are full of them. Old colleagues, people from a program you did, the founder you shared an office with.

Researchers Daniel Levin, Jorge Walter and Keith Murnighan asked "hundreds of executives to consult people whom they had not been in contact with for three years or more" about a real work project. The dormant ties turned out to be as valuable as current contacts, often more so, and the advice tended to be more novel and quicker to get (MIT Sloan Management Review, 2011). Their summary line: "The pool of helpful dormant ties is surprisingly deep."

But we pick the wrong ones

In a follow-up study, the same researchers looked at whom executives chose to reconnect with. The most valuable reconnections were with people who offered novelty, "by not having spent much time together in the past and having higher status," and engagement, "by being trustworthy and willing to help" (Walter, Levin and Murnighan, Organization Science, 2015). But the executives preferred the opposite: people they had spent a lot of time with, "thereby actually reducing novelty." The researchers trace that to anxiety about reaching out.

In plain terms: your gut picks the comfortable old friend. The data says pick the person you only worked with briefly who is now further along, and who seemed like a decent person.

Your fear of being awkward is miscalibrated

The anxiety is the real blocker, so it helps to know it is mostly wrong. In a set of experiments "involving more than 5,900 participants," psychologists found that people who reached out "significantly underestimated the extent to which recipients would appreciate the act of reaching out" (ScienceDaily / American Psychological Association, July 2022). In the field experiments, people sent "a short note, or a note and a small gift, to someone in their social circle with whom they had not interacted in a while" (PsyPost).

The detail that matters most here: people underestimated the appreciation even more "when the communication was more surprising" or when "the social ties between the two participants were weak." Weak and dormant ties are exactly the people you feel most awkward writing to, and exactly the people who are most likely to be pleasantly surprised.

How to find your moderately weak ties on LinkedIn

LinkedIn does not label tie strength, but you can estimate it from things you can see. Sort your network into four rough buckets:

• Strong ties. You message regularly, or you share lots of mutual connections. Great people, but they mostly know what you know.
• Moderately weak ties (the sweet spot). You have met or worked together a bit, you share a handful of mutual connections (the study's inflection point was around 10), and you have not talked in a while.
• Dormant ties. You knew each other well once, three or more years ago, then lost touch. High value, especially the ones you knew only briefly who have since moved up.
• Very weak ties. You accepted a request and have never interacted. Low trust, so a message needs a strong reason.

You can do this by hand for a few dozen people: open a profile, check the mutual connection count, think about when you last spoke. For a network of thousands it gets slow, which is where a tool helps (more below).

When to reach out: moments, not reminders

"I should reconnect with people" never gets done because there is never a reason today. Look for moments instead. These are the ones that work best:

1. They changed jobs

A new role is news, it is about them, and it often means new budget, new problems and new hiring. The catch is that you may not hear about it. LinkedIn lets members choose whether to notify their network about "job changes, education changes, and work anniversaries," and when they do, that "may generate a post in your network's feed, an in-app notification, or an email notification" (LinkedIn Help). Plenty of people switch that off, and even when it is on, the post competes with everything else in your feed. The same help page notes that anyone who views the profile sees the edit right away. So the reliable way to know is to check profiles, not wait for the feed. Our guide to seeing who in your network changed jobs covers the methods.

2. They engaged with your content

When a weak tie reacts to or comments on your post, they have just thought about you. That is the warmest possible moment to say hello. A short "thanks for the comment on X, curious how you are handling that at your company" is not cold outreach. It is continuing a conversation they started.

3. They posted something you have a real view on

Comment on it first, publicly, with something useful. If they reply, you now have a thread, and a private message the next day feels natural.

4. You genuinely need advice

This is the move the dormant-ties researchers actually tested: asking for input on a real work project. Asking for advice (not a favor, not a meeting) is a small, flattering ask that people can answer in a few lines.

How to write the message

Keep it short, specific and about them. The research above suggests three rules:

1. Lead with the specific shared history. It shows you remember them, which is the part recipients appreciate.
2. Give the reason for now. The job change, their comment, their post, your question. A reason removes the "why is this person writing" question.
3. Skip the apology, keep the ask small. No "sorry it has been so long." If you ask anything, make it answerable in two lines.

For more templates, and the three messages that never get replies, see our reconnect guide.

How often

No study gives an ideal number, so here is a rhythm that is easy to keep and does not turn you into a spammer:

• Three to five reconnects a week. Enough to add up (150 to 250 a year), small enough to write each one properly.
• One weekly session. Pick the names on Monday, write during the week.
• One follow-up, at most. If someone does not reply, try once more weeks later with a new reason, then leave it. Silence is an answer.
• Every reply gets a reply. The goal is a conversation, not a sent-message count.

LinkedIn's rules matter here too. Its policies say it does not allow "untargeted, irrelevant, obviously unwanted, unauthorized, inappropriate commercial or promotional, or gratuitously repetitive messages" (Professional Community Policies). Personal, specific messages to people you actually know are the opposite of that.

From posts and comments to booked calls

Posting and commenting are not separate from relationship-building. They are how you create the moments above. The chain looks like this:

1. Show up. You post or comment on something in your field. LinkedIn notes posts can appear in people's feeds "because a connection liked, commented, or shared someone else's post" (LinkedIn), so your activity reaches your weak ties without you messaging anyone. Our guide to commenting for reach covers how.
2. Notice who responds. Someone from the middle of your network likes or comments. That is a signal.
3. Say hello. A short, personal message that refers to what they engaged with.
4. Have the conversation. Two or three messages back and forth. Ask about them.
5. Offer a call when there is a reason. "Want to compare notes for 20 minutes?" lands well after a real exchange and badly as an opener.

There is a bonus effect. LinkedIn's relevance page lists "who you interact with frequently or recently" among the signals it uses for your feed (LinkedIn Help). Talking with someone tends to keep their posts in your feed, which gives you more natural reasons to stay in touch.

What the research says, and what is myth

Supported

• Moderately weak ties were the most useful for job moves in a 20-million-person randomized experiment (MIT News on the Science paper).
• Dormant ties give advice that is as good as or better than current contacts, and often more novel (MIT Sloan Management Review).
• People choose comfortable dormant ties over valuable ones (Organization Science, 2015).
• Recipients appreciate being contacted more than senders expect, especially when the contact is a surprise or the tie is weak (APA via ScienceDaily).

Myths

• "The weaker the tie, the better." No. The study found the middle wins: "not the weakest, but slightly stronger than the weakest."
• "Weak ties work the same everywhere." No. The effect was stronger in digital industries.
• "Start with your closest old contacts." That is what people prefer, and it is not where the value is.
• "Too much time has passed." The research points the other way: surprise increases appreciation.
• "X% of your network changes jobs every year." You will see confident percentages for this. We could not trace one to a primary source we trust, so we do not quote one. What is certain is that people move and you will not see most of it in your feed.

Your weekly weak-ties checklist

• Monday: list five people from the middle of your network (a handful of mutuals, not recent contacts).
• Include at least one dormant tie you knew briefly who has since moved up.
• Check each for a moment: job change, recent engagement with your posts, a post of theirs, or a question you genuinely have.
• Write each message by hand: shared history, reason for now, small or no ask, no apology.
• Comment on a few posts from people in your sweet spot during the week.
• Reply to every reply. Offer a call only after a real exchange.
• Note who you talked to and what about, so next time you start from context instead of zero.

How wait who? helps with this

Doing this by hand works for a few dozen people. wait who? makes it work for your whole network:

• Sync and sort. It syncs your LinkedIn connections, including when you connected and their work history, and ranks who is worth talking to for your goal: raising, customers, hiring, partnerships, building a brand, or keeping in touch.
• Moments, found for you. It flags job changes and shows who engages with your posts, so the reason to write is right there with the name.
• A draft you edit. It suggests a message based on your shared context. You change it, you send it. Nothing goes out without your click.
• The reach side. It finds popular posts in your field to comment on and shows how far your comments travel, so your public activity keeps creating new openings.

If staying in touch is your main goal, see how people use wait who? to keep in touch.