Twitter’s weird. It’s a bit hard to wrap your head around it. My best advice is to worry about that later. Whatever Twitter is and whatever it does, it’s evolving. So, don’t worry about understanding it before you use it. Through using it you’ll come to understand it, and maybe you’ll even figure out new ways to put it to use.
That said, there are some things that are helpful to know.
What is a Tweet?
Let’s get this out of the way:
A tweet is a piece of text no longer than 140 characters. Spaces and punctuation count. Think of it as a blog entry, a bitesized blog entry.
For reference, that definition is 140 characters long.