Colon/third-person, definitely. Otherwise you're limited to only statements about how you feel and stuff, no questions or information--or it's really awkward if you do.
Also, when I'm reading from Tweetdeck (a popular desktop Twitter app) it looks really bizarre when the icon appears to be what's starting the sentence, since the name is tiny and below the tweet.
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Also, when I'm reading from Tweetdeck (a popular desktop Twitter app) it looks really bizarre when the icon appears to be what's starting the sentence, since the name is tiny and below the tweet.