A bridge is a post or comment that people you trust uptrusted, and so did people you usually don't trust. That is rare and telling: it reached past your usual people. UpTrust marks it for you wherever it shows up, so you spend less time in an echo chamber and more time near the things that make you think twice.
How a bridge forms
Nobody labels anything a bridge. UpTrust works it out from how people uptrust, weighing each vote by how much you trust the person who cast it. When the people you trust lean toward a post or comment, and so do the people you usually don't trust, a line appears beside it with a small arch: Uptrusted by people you trust and people you usually don't trust. Tap it to see why.
Votes are secret. You never see who uptrusted it, and a mark only appears once several people on each side have, so it can't point at any one person.
Bridges are personal
A bridge depends on your trust network, so the same post can be a bridge for you and not for someone else. It all comes down to who you trust and who you don't.
Where you'll see it
Want to go further? You can ask someone to reply in a thread with many sides, or browse the marketplace of open asks.