If there's anyone like me who is pretty clueless about Twitter, intuitively reluctant to get involved in it, yet curious because it has become a seemingly potent socialising tool and feel that maybe you're missing out/just being an old fuddy duddy, then maybe you will find this Guide Book useful. Haven't read it myself yet but it looks as though I'll have to at least do that and see what it's all about.
Blimey Ron that looks a pretty comprehensive guide! It's a lot easier than that just to play with though. More about up to date short information than threads or discussion/forums, but very useful, especially if there's a riot, football match or similar high energy activity taking place in a local area.