I don't think it's a good idea because for one, it's not facebook. It's your own community. If you don't have the same friends existing on your network as on Facebook, then what does it matter to have those posts, or likes, pictures or anything else that resides on your Facebook page? I think it's better to start fresh considering you have to have your friends on your new site. The outcome will be broken up conversations with people that don't exists, likes on people that don't exists and a lot of one sided conversation. Everything you do on Facebook pertained to who you know or knew on Facebook and what was occurring on Facebook.