Google is really pulling out all the stops when it comes to pushing the new +1 button. Now Google will be +1’ing AdWords ads. In fact I am seeing them already.
“The +1 button itself will appear next to your headline on search ads. Personalized annotations will appear beneath your Display URL. For example, Maria +1’s a page selling a neat laptop holder on a website. When a search ad
with that same URL appears, her friend Sam might see the ad with the note “Maria and 28 other people +1’d this.”
With the +1 button Google is banking on increased growth in the social sector. With your connections and friends now able to personally, via the +1 button, recommend sites and products ads are now instantly more relevant and personal.
Make sure as you allow the +1 button results to show up in your Google.com search results that you understand that others can see sites that you +1 and that this results can be tied to your name.
For AdWords, I would imagine that +1 button votes will count heavily into the hidden quality score factors in the months to come. Google may never tell us about this, but with relevancy being the code word for all Google does, I expect +1 to be SERP and ad changing pretty quickly.