Great idea!

It's a nice start! The design can use some work, but that shouldn't be a problem. My biggest "eeehhhh" is that the site is using xHTML. You should make the switch to HTML5 and the most up-to-date W3C stabdards. You should also remove the header that says "Advertisements". I think that's a turn-off for a lot of people. Looking forward to what the future holds for a crypto social network!