NEW YORK (AP) — Facebook is introducing hashtags, the number signs used on Twitter, Instagram and other services to identify topics being discussed and allow users to search for them.

Facebook Inc. said in a blog post Wednesday that users will be able to click a hashtag to see a feed of discussions about a particular topic. For example, typing a number sign in front of “ladygaga” or “sunset” will turn the words into a link that users can click on to find posts about Lady Gaga or sunsets.