Why do people use twitter?

This is really just my totally lack of understanding about why people use twitter? I don’t get it? My mom would properbly love it (so would I if it  meant that  I should start every (And I do mean every) conversation with  “what have you been doing the last week? I have not been able to reach you at all? You work too hard, don’t you”).

Elsewhere I don’t really get it? Anybody out there???