[Broken_Hippo]

I*ve been wanting something like this for a while, but I usually use Facebook as an example.

Right now, facebook is like a phone company that only allows folks to communicate with others using the same company. If you could see pages on other platforms and chat with users on other platforms - at least to an extent - that would open up some space for competition and overcome the most difficult part of building any "replacement" or competition to facebook.

All that said, I think this is probably a problem that is more complex than I make it out to be and it might or might not be a feasible solution. The first hurdle would be deciding on the standards for this stuff.