I was wondering under what kind of legal form sites as Facebook, Twitter and such exist. Or in general, what kind of legal form do websites on which you earn revenue of advertisements have?
Even more general; what are the restrictions for starting a website that earns revenue through advertisements?
I am planning on launching a website which will have no advertisements whatsoever on startup, so this website could be regarded as a simple 'hobby' or free service. The thing is I do not really understand what changes once this website would / could start earning revenue through ads.
I hope someone will be able to help me answer these questions.