I ditched FB about a year ago. It just got creepy on so many levels.
As for posting elsewhere online? Well, I’d like to see a snatch and grab of a 100 pound amp and 130 pound speakers. And even if they were stout enough to do that, they’d have to get past the angry owner who is generally well prepared to defend his home.
I live downtown in a small city. There are frequent petty crimes, yard tools, stuff left out, stuff in unlocked cars, even a break-in down the street a few years ago. Everything taken was small and no-count. Primarily young stoned crack heads committing crimes of opportunity according to cops. Just to get a few bucks for drugs.
To steal a serious hi-fi system would have to be a planned hit looking for a big score....which would be useless around here...no pawn shop or fence is going to give a plug nickel for hi-fi equipment. No real market.
So I think we can all relax.....unless your home and goods are super flashy and enough to interest serious thieves...