Please explain. Are you saying that App.net is using your data anyway to sell ads or something else?
"We are selling our product, NOT our users.
We will never sell your personal data, content, feed, interests, clicks, or anything else to advertisers. We promise."
Which means they are just lying in their about page.
Making money through you. (Like all user-generated content websites)
You are not being "sold". That entire line of thinking is intellectually lazy and meant to provoke an emotional response. I wish people would stop it.
A reasonable analogy would be conferences, are you paying for the venue, or the access to other people/speakers? does that mean the people/speakers are the product?