I don't think Facebook has a monopoly on eye-ball shares in particular. They might have monopoly on social networking as such but given they're not the only thing a person will see in a day by a long-shot, I can't see how they're being more anti-competitive than a TV network (which also has a large but limited share of views).
> They might have monopoly on social networking as such but given they're not the only thing a person will see in a day by a long-shot, I can't see how they're being more anti-competitive than a TV network
Almost no-one bellow the age of 40 cares about TV anymore (apart from sports events), you're pretty off on this one.