The dominance of Facebook in social media is very worrying, with 750 million users worldwide, Facebook is a very tough Google's rival. Previously Google was trying to make social networking sites like Orkut, but it failed to compete with Facebook.
To rival Facebook, Google released a new product that is Google+, and it seems these new product got a very good response from the users. Within two weeks, Google+ already used by more than 10 million users, or about 1.3% of Facebook users, and of course this is a serious threat to Facebook.
Facebook even has a real action to maintain their dominance by banned the Google+ ad on their site, an act that should not be done by companies like Facebook because it is not a wise action, it could even hurt themselves later.