As an experiment (and before I let anyone go anywhere that near my employers precious website with it) I added the google +1 button to this blog today.
Unfortunately while I understand the idea of giving a bit of content an Big +1 I can't see where anyone would know that I've +1'ed anything.
If you have more of a grip of reality than I do, do let me know!
UPDATE! I found out, you need to use google.com not google.co.uk.. hardly had I done this and +1'ed things than +1's started showing up in my search results..
 I had to go to my google profile, enter a search term in the search box, then click "reset search tools" and I was on google.com instead of .co.uk