Quite true, you never know what’s going to appeal to people, but that doesn’t mean it’s better to just “throw stuff out there.” Anyone posting should understand that frequency (that’s what social media offers) helps you get better. The endgame isn’t say, “It doesn’t matter how well I write, some of the stuff I thought was crap went over big.” Occasionally it does, but usually it doesn’t. What gets read is cumulative. People see a few good posts of yours and start coming back. It’s the continuing presence of your work that attracts views and recommends. If you’re not constantly getting better, guess what? Someone else is. They’ll be the ones attracting a solid and growing audience. That’s your competition. Be aware of it.