Im just wondering that how much would it cost to build a custom script which has functions from those social network sites. The function which im looking for is, that of if 1 person registers they have the option of giving their hotmail/yahoo/gmail username and password and can invite all there contact to that site. How much would it cost to build that?
I started building one. www.simsportal.net though it has much more =). I'm about to add more picture options and blogs next =). If your interested i'll sell you the script.