Come up with a unique or clever name and concept. When it comes to social I would say your site better have custom/unique pictures, videos and written content in the order. Or you could just focus on video or Pictures, content almost always comes last, written content anyway.
Here is a great idea for a site, and nobody is doing it right now. "Cross over battles".
Superman Vs Hulk
Batman Vs Wolverine
Gamers, comic book geeks and movie goers a like would love a site with nothing but this kind of stuff. It would be incredibly easy to market on social sites, and money can be made from Adsense or Amazon.
You could have all kinds of vs battles, Serial killer Dexter Morgan Vs Hannibal Lector, Battle of the gods, Odin Vs Zeus etc.
I would love to make a site like that, but I'm invested in something totally different right now, Plus if I made it, I know I would love it to death, so it would have to be done right. No crappy theme, no copied images, custom everything, and that takes a lot of money.
Anyway this is my idea for a site that would receive a ton of direct traffic, natural links from Facebook, Twitter, Youtube and niche forums, oh and niche blogs, high pr ones at that.
I ran this idea by a few employees at Gamestop during my last visit and they went crazy, customers started joining in and giving suggestions also lol. Whoever makes something like this will be a millionaire.
Btw yes I'm a big kid, video games, and cartoons are a big part of my life so what .