It’d be interesting to see if Google started doing this, I think it’s potentially a very risk move.
If you’re unsure what Google +1 is, it’s Google’s version of Facebook’s popular like button. Here is what Google has to say about it:
The +1 button is shorthand for “this is pretty cool” or “you should check this out.”
Click +1 to publicly give something your stamp of approval. Your +1′s can help friends, contacts, and others on the web find the best stuff when they search.