Share/Add This Buttons on sites

I’ve noticed a change of buttons lately on sites where you can bookmark/share the relevant information. So I’ve done a cross sample of A Computer Site –, The MySQL Acquirer –, A News site – and a technology information site –

What got me to go back and research is I’d never seen a FaceBook icon before, or perhaps I’d never paid enough attention.

At the end most sites now wash out to a site called Add This.