Spammers are bad. Trolls are worse.
I use livejournal. Someone else friended me, and we talk a lot out of shared interests and conflicting personalities. A number of \"creeps\" have targetted her and now post insults and random things on her livejournal using fake livejournal accounts created specifically to harrass others. They then moved on to all the people who post in her journal, including myself, and my other friends have now been \"infected\" as well. Block one fake account and three more pop up.
Individuals like that (trolls, bullies, stalkers) are pretty low to me.