Twitter made headlines in 2010 with a plethora of fresh features and new offerings. But its users also consistently broke news and made news via the tweets they shared.
We've picked the top 20 tweets of 2010, which include posts by a range of Twitters, from Michelle Obama to Sarah Palin, Lady GaGa to John McCain.
Click through the slideshow below to see the memorable tweets from celebrities, politicians, hackers, and other Twitterers (some of which you may never have heard of). Are there other tweets we should add to our list? Click "Add a Slide" to submit your suggestions.