I've been doing a lot with Social Media since Atlanta Startup Weekend 2, and Twitpay. One thing that strikes me about Twitter is that it's just easy. I've created the following graphic based on the amount of work you have to do to participate in Social Media.
Twitter is so easy to use, all you do is sign up, and start tweeting from the Twitter site right away. The great thing is that from there the experience only gets richer. There are so many platforms to Tweet from and to read from, and a whole set of tools and services have organically grown up around the Twitter platform. Reply's and re-tweets are easier than commenting on blog posts (no captcha and no signing up). It's short and sweet, unlike on a social site like Facebook (get your flair!), Flickr (upload all of you photos, tag em..) or linkedin (update your profile and all your connections). From there it can go all the way to a full blown web site with a multitude of content (ala ZeFrank). Do you agree? Leave a comment or reach me on twitter at www.twitter.com/ideakitchn