If it is what you want to do, you just have to do it. I was playing major, costly games on Facebook (Mafia Wars, etc.) and had over 1000 "friends" to support them, etc.; I deleted the friends who weren't truly known to me/my actual friends and family, deleted/blocked the games, sent a message to my friends and family that I wouldn't be coming on as often and now I maybe show up every couple weeks or even only once a month. I picked another health-related site I preferred and go there and here, instead.

If you want other people to help you stay away, just tell those specific people to give you a hard time if you show up before X date.