>Power is very different from influence
Influence is a function of power, it's in the very definition of the word:
1. the ability to do something or act in a particular way, especially as a faculty or quality.
2. the capacity or ability to direct or influence the behavior of others or the course of events.
Does FB not have the ability to influence behavior?
Even if you choose not to visit FB (I don't), that doesn't mean FB has no influence over your life, especially when many/most of your friends and billions of others are plugged into it. Unless you live on Mars.