User blog comment:RePeat/Community Poll on Message Walls/@comment-18933973-20130624000420/@comment-4910132-20130624015445

Say you're retiring to another website and you don't want anyone to know about it except MAYBE your best friend. It'd be better to write on their talkpage in a jammer, rather than make a whole message wall. Wouldn't you think?

I know jammers aren't foolproof, but it's the best way to not draw attention to yourself.