In the ethical sense, propaganda bears the same relation to education as to business or politics. It may be abused. It may be used to over-advertise an institution and to create in the public mind artificial values. There can be no absolute guarantee against its misuse.
Bands now are always trying to make their presence known through social networking and whatnot, but that's just the same as bands before the Internet age trying to connect with fans in some other way. But I don't follow people on Facebook, I think that's creepy. I wouldn't want them following me on Facebook. I don't even have a mailing list.