This Twitter taking up so much of my time..........

Not too long ago, I really couldn't see the point of Twitter. It just seemed like a total waste of time.
Now after reading a Lifehacker article about it, I find that I'm enjoying wasting my time on Twitter. Ironic, huh?
Anyway, here are some links that helped me know some more:
1. Some useful video tutorials
2. How to make a custom Twitter background (the space outside the Twitter panel)
3. What's being tweeted in your city?. Actually, only 57 supposedly international cities are included here but 45 of them are in the USA. Nevertheless, while not exactly where I am now, at least Dublin in Ireland is included.