It's that time of year again, when everyone starts looking back over the past year and compiles 'Best of' and 'Worst of' lists. Twitter's been unveiling its annual 'Year in Review' since Thursday and has just published its 'Hot Topics' lists.

Uber-Twitter user Charlie Sheen's clearly still winning online: Last week AOL announced that Sheen was our most searched-for celebrity in 2011, and now he's claimed the top spot in the Twitter "Actor" Hot Topic.

Plus, one of his stranger obsessions -- #tigerblood -- came in at Number 2 in the "Hashtags" category (just behind #egypt).

Check out who and what else made the cut after the jump.