I will share sometimes, if it is worth sharing ("used to share"/"was", as I went off FB a short time ago), but I always credited the person it came from and usually told them that I had shared something they had posted. They always just "liked" (in that FB way) the fact that I shared, and nothing ever came of it. It was not regarded as "stealing". I never had someone just snatch a thought or personal idea off me and post it as their own. That I know of. Some people are really toxic on social media, and it's best to block them. It is one thing to have people accessing your page who might not agree with you on everything - if they behave themselves, let diversity, uh, reign. If you feel "personally targeted and uncomfortable" with the way they are acting or what they are putting on their page, block them. An ex's new partner put some trolly stuff on their FB page that was clearly intended to thumb a nose at me and provoke me (long after the heat of the situation had died down, and this, from someone who - although childlike and spiteful by personality - is older, and occupies a sufficiently high govt position that you would think they would have more gravitas). At one point in my life, and it was actually not too long ago, I would have unwittingly let this person sink the hook right in and elicit a reaction out of me. When I saw that stuff on the person's FB page, though, I thought, "hmm, this person is angry and immature enough to take THAT much effort to poke me with a stick years after our conflict, rather than just work with me politely on the matters we are forced to interact on". Another person I merely defriended (not blocked) because he couldn't stop disagreeing with me politically and kept making snide remarks. One of those who only wants friends who share his own beliefs and can't simply "ignore what he doesn't agree with". The upshot, IMO: social media has a lot of potential human drama pitfalls, so use the tools these media provide to minimize the drama and take out of it what you want.