I often get into conversations with others on Twitter. It's not just about your updates, and it's not just about someone else's updates---it's about updates from people you're interested in.
The Twitter conversations I've had are kind of like broadcast IMs---and if you're a follower of both people involved in a conversation, you see both ends if you like.
If you follow people, many of them will follow you back, and you'll get to see plenty of conversation.
If you twitter interesting things, people will find you and follow you.
Twitter goes beyond little updates every few minutes, or just twittering what you're doing. It's micro-blogging and networking with people. Especially networking is important.
And then there's
FriendFeed.
I'm
http://twitter.com/ArachneJericho
and
http://friendfeed.com/arachnejericho