I still have accounts on at least one of those sites.
Thing is, most of the people on them are very young girls, and that just breaks my mommy heart repeatedly. It's pretty good motivation to stay away.
In any case, you didn't do something BAD, you did something good and strong because you didn't join or fall back into old patterns. The thoughts, the feelings, the temptations, they are going to come up... it's what we do with them that matters