Wow you guys really dont know about Twitter
In a sense its like live blogging. You post short messages using your computer/phone about what your doing and thinking.
ex.
6:30 Ordered dinner. Having Pizza again.
6:45 Pizza arrived. Watching TWC. It seems like my intellistar unit is starting to late.
...
10:00 Going to bed
Some people love it, some people hate it. I think its neat to see what your friends are doing but its just too time consuming for me