Where your headline actually appears
The headline is not a profile field so much as a signature. It follows your name into search results, comment threads, connection requests, message previews, notifications and the little card that appears when someone hovers over you. Your profile summary is read by people who chose to visit you; your headline is read by everyone else.
That asymmetry is the whole argument for spending time on it. A person deciding whether to open your profile, accept your request or reply to your message is usually working from those few words alone.
How recruiter search reads it
Recruiters search by job title and skill, and the headline is one of the fields weighted most heavily in matching. If you are a product manager whose headline reads “Building things people love at Acme”, you will not appear when someone searches for a product manager — however good you are at the job.
This is the most common and most expensive mistake on the platform. Personality is fine, but it belongs after the searchable words rather than instead of them. Use the title that recruiters actually type, then add the character.
The first sixty characters carry the weight
You get 220 characters, but not all of them are equally visible. In comment threads, search results and mobile views the headline is truncated somewhere around 60 characters. Everything past that point still counts for search, but a human may never see it.
So the structure that works is front-loaded: role and audience first, proof second, personality last. “Product Manager for B2B SaaS · Grew engagement 38% · Writing about discovery” survives truncation with the important part intact. The same information in the opposite order does not.
How often to change it
When your role, your target or your proof point changes — not weekly. Frequent edits push profile-update notices to your network, which gets noticed for the wrong reason and slowly trains people to ignore your updates.
One exception is worth planning for: if you are searching privately, keep availability out of the headline entirely. The platform has a private setting that signals to recruiters only, and using it avoids telling your current employer something you had not planned to.