I've done RS on an cheating ex that I would like to apologize and feel some sort of regret and remorse for what he did.   In the week that I did it, his current(1 that he cheated on me with) went into his FB account and set his account to read that he was in a relationship with her.  He removed her name and deleted her. Then switched his status to single.

Other than that,  I stick to my intended target.  I personally wouldn't try it on a friend b/c I don't want them feeling *special* about me.