One of the foundations of the social web is viral content, which is, at its core, based on recommendations. It's why sites like Digg are so popular. That's why it's no surprised to see Google Friend Connect launch a recommendation widget.
Via the new widget, sites using Google Friend Connect to enable social networking now have a vehicle to support content recommendation. This can help give the networking on a given site momentum - and act as a magnet to attract new and repeat visitors.
Here's a video explaining more: