Even the shortest form of internet communication that I know of, a tweet, isn’t really only 140 characters long. The best tweets always have a link to something longer. (This assumes, of course, that you’re on Twitter to learn something, as opposed to discussing lunch, swooning to the Beebs (@justinbieber) or hating A-Rod (@AROD).)
A good linked tweet is like a good headline, an irresistible invitation to learn more. Usually, the link lands you on a page with a news story, blog post, or....