I dunno if this is realistically practical. Right now the reason people do this is basically because of a combination of a perception that doing so adds value to the page and the fact that it's incredibly trivial because the web frontend platform is relatively uniform.
Having to add and maintain a backend shunt for the data though? That's not something that's going to creep on to every single website in existence like facebook like buttons have. Hell, it requires you to even have a backend, which many sites that have these buttons barely even have.