I do see accounts on here that I suspect as fake, for sure. What I worry more about for me, is undercovers, if I begin to communicate with people in my region. I had a brush with an undercover about 8 years ago. We met at a sandwich shop. Thankfully, I wasn't in a hurry to have anything private with her. After I wasn't pushing for anything, she claimed to be 17 years old instead of over 18. I smelled a rat at that point. Then, she asked if I could hook her up with some pot. That confirmed the rat that I smelled. She also had to take breaks to talk to her boss. Whew, that was actually true..... her undercover boss, not sandwich shop boss.
Be careful!
I did have luck on Beastforum way back in the day. I met a 40 year old nudist couple that was interested in k9 experiences for her. They were the type to only post on the personals section. Those types of real people do exist. What I look for are people that post ads using swinger type lingo, or they know how to write an adult add for casual type sex. They usually have been a swinger, into BDSM, or some other alternative sexuality. They will more likely be real. I'm sure there's some newbies that show none of those signs, but those real people will also post in the less sexual parts of the forums, usually.