Apple doesn't have the highest market share in any category. Samsung for example, even if they're not quite there in terms of net income due to lower margins, is a much larger company. Actually there are plenty of companies who are both larger and wield considerably more power/influence.
Facebook is pretty much a dead man walking in my social circles. The last time I opened Facebook, it was to change my relationship status roughly a month ago. I don't know why I even bothered. People have no problem with migrating to another social network. It happened plenty of times in various countries (from and to facebook), and it will happen again.
Saying that these companies "dominate" (i.e. control) our daily lives is laughable. Most are hardly more than a tool. I am not dominated by my screwdriver just because I use it daily.
Even if it has some advertising on it.