I love Twitter but hate Facebook with a passion. I find FB too commercial and complicated. Twitter is a lot simpler. The other thing I like about Twitter is that it can be used as a news feed, kinda like an RSS feed. Its a great way to keep up with the news.
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Facebook is mostly for people you know, twitter is for people you wish you knew
Both let you follow articles of interest ie; science news. Give it a go. I know lots of people on both.
Now...Bebo vs Faceparty...theres a discussion