Social Network site Geared for Unity3D Apps/Games

I am creating a Social Network site From scratch based off of Facebook...

The main selling point for this site will be 3d games and apps built using Unity3D. So to accomplish this I have a working restful API so you can get the user's account information, profile information, friends, ect.

I am programming a C# version of the API which will allow developers to get all needed information with out needing to know the web addresses for the API. I have a single class called SocialAPI which can be used like the following:

SocialAPI api = new SocialAPI(1);
1 being the id of the player/member...

Then you can access information:
api.First_Name

In the constructor of SocialAPI it sets a static singleton variable so once you create a new SocialAPI you can then access it from any where in the application like so:
SocialAPI.Singleton

You can also write to the player's wall like this:
SocialAPI.Singleton.PostToUsersWall("Demo Title", "This is a demo wall post from a demo app!", "http://www.demosite.com/app", "http://www.demosite.com/img/demo.jpg");

First it takes the title of the post, then the text of the post, then the link to the app, and finally the link to a image you want displayed next to the post...

Ok so now my question is this... What sort of information do you guys as developers want to have access to for your games/applications?

Also what do you like and/or dislike about Facebook's API?

Thanks!

 

Links to the site?

I'm interested in this site/API.