What Does The Google +1 Button Mean For You? - The Next Web | Brand & Content Curation | Scoop.it
At the moment, apart from testing the button out or even trying to game the results on your own site there is very little reason to click on the +1 button.

If I click on the Like button or the Tweet button I know that I am sharing content with my networks and that they will hopefully find it useful, but clicking on the +1 button sends my results into the big black hole that is Google Profiles (nobody really uses them).

This is mostly meant to improve search results but without giving people an implicit reason to start clicking on this, you wonder how many people actually will.