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 - www.dell.com, The MySQL Acquirer - www.sun.com, A News site - www.cnn.com and a technology information site - www.techcrunch.com
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.