It’s a decision you have to make, based on your own real-world social network. I recommend using only one. Pick whichever has most of your real-life friends on it, and drop the other one. Campaign with your other friends to get them to switch. You’ll go less crazy; trust me.
Twitter is not like Facebook or Google+. Imagine everyone in the world is all gathered in one giant convention center, and they’re all talking at the same time. You have this clever device at your disposal where you can choose who to listen to. That’s Twitter.
Everyone should use Twitter, for finding out real-time information like traffic accidents, late train schedules, fires, etc. Twitter is the closest thing we have to a hive-mind today. Use it, at least to stalk your local news sources for information.
Use Twitter to connect to people you “know” via the Internet (like @wilw, @donttrythis). Use Facebook or Google+ for people you know in real life (like your family, friends, co-workers).
