How do you think all of the startups on here really achieve the "viral" growth they all talk about? Heavily targeted ads have allowed niche businesses to get off the ground and become profitable in a way that was not previously possible. Agreed there are problems, and agreed they don't allow much(if any) real control over the targeting from the target's side of things, but to say that don't do any real good is unimaginative as the previous comment said.
