If you’re thinking about taking your search marketing to the international markets, my first word of caution is that what works in the USA does not necessarily translate to success overseas.
I just read via SearchEngineWatch.com that Google will be rolling out the +1 button on display ads. You’ll be able to “+1” the ad as well as see the number of others who have done so along with photos of those who have plus-one’d within your network.
Facebook is drawing in new advertisers each data from the paid search world. However, the principles that apply to advertising in paid search (and even display) do not necessarily apply to Facebook.