Dan Schawbel, the person everyone should be paying attention to when it comes to personal branding, has an excellent blog post on the importance of creating a consistent brand image on all social networks.
As an example of consistency, here's what I've done:
As you can see, I've used the same photo and basic information on all my profiles. When you Google "Alison Doyle" all of these profiles rank well, helping me with my personal and professional branding.
It's also important, Dan also notes, to make sure that you claim your name. The last thing you need, especially if you're job seeking is to have someone else showing up as you.
