If it'll have anything to do with social networks, expect to hear from Facebook. Yes, they're not exact matches, but that's potentially "riding" on Facebook's popularity. (And come on, admit it. Why else register that name?) Better delete it and try to get a refund if it's still within the registrar's initial add/grace period...and that's if they still offer that to end users.
Facebook has successfully sued a lot of people who reg very similar names to them, so not a smart move IMO
I never thought for social net. site but i have DE-registered it today lol your advices are good. I just wanted to make it easier for the people to remember