I encountered this problem in instances like when asking about an MPC-type controller thingy in #music.
I settled for beginning my title with "[help!]" to imply that I'm not sharing content so much as making an inquiry, so people who may be knowledgeable on the subject would be attracted to click, instead of someone digging for news. Your idea would have come in handy in that scenario, but on second thought I say screw it, why should I hide that anyway, because someone may eventually stumble upon that post in a feed and be more interested in that inquiry than on the latest from Pitchfork.
At worst, one could ignore your .personal tag I guess. And that would suck. It leaves me curious though, idk.