Beyond the big three?

If you were to answer  the question, what other social media sites do you think are important, what would you say?
Plurk? Bebo? Plaxo? Buzzflash? SmugMug? Hi5?  Well, which ones?
In the social media space, there are a lot of options. It is important to gain a really good grasp of the main three before venturing out [...] http://bit.ly/c4dyW0