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1) Inject some humor. If you have a sense of humor at all, there is someone on Twitter who will appreciate it. Even if it's quirky, it's a very easy way to reveal who you really are without making yourself vulnerable or saying too much. My sense of humor is a little different, but I have a number of Twitter friends who laugh and some whose off color humor makes me laugh. It makes tweeting more enjoyable, and those particular individuals more memorable.
2) Answer others' questions. When you can't think of anything to tweet, start reading others' tweets. Be helpful and maybe start a conversation with someone who you don't know so well...yet :-)
3) Break all the rules and just let your thoughts spill out. Every now and then you have to go a little crazy. When life spills out, let your tweets spill out. Need...coffee...now!!! Ever felt that way? When you feel that way, tweet that way. It lets everyone know that you are real, genuine, and not just someone trying to blast their own marketing messages.
4) Sprinkle some Ascii art on your tweets. When you only have a few short words, make them stand out with a little Ascii art! These kind of tweets also provide bright spots in what can look like a very boring profile page or tweet feed.
5) Stand out with special HTML characters. Another cool trick you can use to spice up an otherwise boring tweet is to add html "dingbats" to your messages. Add stars, flowers, and even airplanes to your expressions!
And useful exercise for writers: For just a moment, think about the symbolism of caterpillars in various artfoms. Ponder the journey of a caterpillar and all it represents. Now, put yourself inside the mind of the caterpillar, and tell us what and how you feel. Describe your world and your existence intensively. Put us, your readers, right there in your world with you. And use this as an opportunity to actually say something meaningful. You've got three sentences and three sentences ONLY in which to accomplish this, so make them count.
Exercise that literary muscle; make good use of metaphor, simile, personification, metonymy, onomatopoeia, imagery, and any other literary devices you can fit in. Post it as a comment, and feel free to comment on the work of others. However, keep in mind that we are all different writers at different levels in our craft. Be constructive if you dare criticize :-)