My apologies if this has been answered somewhere already but: What does the little red g+1 icon at the top of the home screen actually do? I know it's got some connection with Google Plus (where I have a page) but searching the internet only gives me G1 and a whole load of unrelated stuff; and Google's own help section on this is worse than useless! I can't even be arsed to do a clickie for it... :-p

I imagine the reason for having it here is to help the Cat, something I want to do - but experience has taught me to always find out what I'm getting myself into before I click. Anybody enlighten me? Thanks!