Good for you realizing that. While we are talking about other nations like communist countries restricting the freedom of speech, the western world is doing the same thing everywhere. It causes that more and more people to conceal the ideas in mind, which will finally burst based on some chances of events happened.
While the nations ruled by dictatorship have defined rivals and enemies clearly from external places, democratic countries have to constantly and selectively import or generate enemies from internal sources to keep he society stable. In this aspect, social network tools are both used as propaganda machine for diplomatic purposes, and social engineering machine for conducting civil attitudes that backs up the will of state. It is the same as the commies after all.
With another round of war storm is looming, it would be clear in your mind to understand what sites like facebook is really for.