Just because you don't like something doesn't mean you think it is immoral.

For example, many people against Facebook simply want to be in better control of their online identities, and have privacy. I am in this boat. I don't think Facebook is 'evil', or sharing my data with 3rd parties is a 'sin'; I just think society would be better off if privacy of this kind were more strongly controlled by individual choice, rather than the whim of a corporation.