That Really Grinds My Gears...Combining Social Networks

Facebook, Myspace, Twitter, Four Square: All unique social networks with their own identity. Some people have all and some people have a few. But what grinds my gears is when you update one status and it goes everywhere! Facebook users and not all on Twitter so seeing the RT and "@" symbols on a Facebook status is annoying. Some people who aren't really into social networking will most likely wonder what, "What the hell is that." Also, if you're on Twitter and Four Square, why would you check-in with Four Square and have it update your Twitter? Wouldn't there be no point to it then?

Thoughts?