Power Constructs Within Social Media

Who holds the power within Social Networking sites?

Who are the powerful ones?

Who are the influencers?

Are they those people that have the most followers or friends?

Are they the ones that spread across the most number of networks?

Does it come down to whoever writes the applications in the first place?

Does it matter in which network participation occurs?

How much time is spent gaining network acknowledgement?

What percentage of power-holders are mobile Internet users too?

What kind of lifespan does an individuals power to influence have?

Are trend-setters and power/influencers the same?

How does new media succomb to the controls of old media? (there is a lot of discussion about how radically different it is to traditional media but where is it the same or controlled)

Just random questions I have.