High Quality Content by WIKIPEDIA articles! Favstar (also known as favstar.fm) is an online service which tracks Twitter and Twitter usage. Favstar uses data from user "favorites" - or when a Twitter post is bookmarked (starred) by individual users. As posts, or tweets, are given more stars, specific posts move up in rankings according to different criteria, including recent posts, newer posts, and all-time favorites. Favstar uses open authorization as a means to sign in.