Google achieved dominant market position through legal and fair market competition. If you want to regulate them introduce Internet Search Engine laws do it the same for Internet Social Networks and Internet Social media. They are not breaking Google up that's for sure.
Listen what Larry Page said "data in data out" with Facebook and with Google. If internet service allows you to export your data and move it to the competing service there are no problems.
"You don't want to be holding your users hostage. We want there to be a competitive market, we want other companies to be able to do things so we think it's important that you as users of Google can take your data and take it out if you need to or take it somewhere else." [1]