The feature lets users search for posts they've previously seen from friends and Pages.
Nearly 150,000 tweets appeared a full two days before cable news networks covered it
The move comes with some conditions, however.
Take the struggle out of social with tools that help you plan your posts and juggle multiple accounts.
What's that hashtag mean? You may soon be able to find out.
You'll no longer be able to send messages from Facebook's main mobile app
This app creates a daily time capsule that's all about you.
Somebody better call the burn ward.
The company's Connected app uses a cards interface to deliver updates on people's contacts
Greek police made two arrests last week, Facebook said
Your Internet service provider knows an awful lot about you. But when you’re on Facebook, your ISP is the least of your privacy worries.