The Jonas Brothers recently did a live video chat with their fans.
They addressed whether they have Facebook, Myspace, and/or Twitter.
Here is the video:

They answer this question starting at 2:39.
For those of you with a slow internet connection here is their response.
Fan typed this question to them:”Do you have personal Myspaces?”
Kevin: “No, we only have the [...]

In short, Yes.
There are many Real Celebrities on MySpace. And there are a many ways to tell who is real and who is not. So, how do I know who is real and who is a poser?
1.  Check http://www.realcelebrityprofiles.com. (I know this one is obvious but still!)
2. Real Celebrities on MySpace usually always have more [...]