All of that is valid, but you shouldn't worry about it until it actually becomes a problem.
99% of the struggle for any social network is getting people to use it at all. Those problems you list would actually be great to have to deal with, because it means the network is taking off.
99% of the struggle for any social network is getting people to use it at all. Those problems you list would actually be great to have to deal with, because it means the network is taking off.