My idea of a perfect social media platform is somthing actually tailored to me an my intersts.
You start off as with most, imputting relevent information (with the ability to hide what you wish) and selecting your intersts. However you can also select uninterests, things you do not want to see at all so you can really create your own space.
This selection would generate the adds most likley to interst you so no need to lurk in the background see what other sites you go on or google.
People can create groups based on interests. These would be divided up in to custom categories so you can browes your intersts individually, as a group or all to gether on the main news feed.
Of course you can add friends and family to see what they are up to. They also are put in to a "friends and family" catagory.
Basically, I would like a cross between Facebook and JA.