"You've told us the most important thing is being able to find posts you've seen before, and now you can," said Facebook vice president Tom Stocky in a blog post.
"With a quick search, you can get back to a fun video from your graduation, a news article you've been meaning to read, or photos from your friend's wedding last summer."
Facebook said in August it was testing the search upgrade and that it would be available this week for users of Apple devices and on the desktop version of Facebook.
In 2013, Facebook announced its "graph search," which enabled users to dive into the vast amount of data which they can already access. The social network has promised upgrades to this service.
Facebook allows users to search posts, but only those to which they would have access under privacy guidelines, such as posts from friends and public messages.
"Your search results are personalized and unique to you and, as always, you can only see things that have been shared with you," Stocky said.
"Search at Facebook is a long-term effort. Today is a step toward helping you tap into the experiences and perspectives of your friends."
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