Saying that there haven't been any antitrust cases against Google and Facebook is simply inaccurate. Google got popped with a 2.4 billion euro antitrust fine for abusing their search monopoly just last summer (example source: https://www.theguardian.com/business/2017/jun/27/google-brac...).
Yes, but there have not been any in the US. (This is likely because of the amount of money Google 'invests' in politicians.)
Note that the EU case is only the first of three EU antitrust cases against Google. They're also about to get hit with (rumored to be even larger) fines for abuses with Android and AdSense.
Note that the EU case is only the first of three EU antitrust cases against Google. They're also about to get hit with (rumored to be even larger) fines for abuses with Android and AdSense.