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If you didn't hear, yesterday Charlie Sheen joined Twitter. Today he very well may reach 1 million followers (as I type he's already passed the 900K mark). How did it happen?  Why all of a sudden did he wake up and decide it's Twitter time? And how was it that Charlie Sheen went from non-twitterer to hardcore twitterer overnight?  Short answer: he got a lot of help from a team of experts at Ad.ly, a small Beverly Hills start-up that focuses on celebrity endorsements via Facebook and Twitter.

ONE HAS LATELY heard much of the hashtag. That is, the Twitter symbol #, used to categorize a tweet. Charlie Sheen's first tweet, for example, was famously: "Winning ..! Choose your Vice... #winning #chooseyourvice." #Winning has gone on to live in irony across the Twitterverse, in mockery of the eternally less-than-winning Sheen. But even President Obama recently urged students to tweet their senators about raising the interest rates on federally subsidized student loans with the hashtag "#DontDoubleMyRate." The new thing, however, is using the word "hashtag" in conversation. Especially if you are under a certain age, you may be catching people saying things like, "I ran into that guy I met-hashtag happy!" or, in response to someone complaining, "My flashlight app isn't working," perhaps you have heard the retort, "Hashtag First World problems!" A college student not long ago reported a favorite witticism to be appending observations with: "Hashtag did that just happen?