Google recently released a pretty need system similar to Facebook's "Like" system. Its called +1.
Basically, it lets you share a page when someone does a Google search.
You can read more about it here:
Google +1 Button
So I've added the code to the top of the page, and the +1 works per page. So you can click on it on the homepage, but then you can also click on it if you're in a thread that you want to "like".