Well it happens from time to time; somebody signs up, asks a question, gets some kind of response, and that's it. Depends on their expectations. If they haven't been reading FL for a while, they won't know us from any other random forum. They expect very little, so once they get a little, they go away. Heck, they might think we're all here, just standing by for any random question. Like the Microsoft user forum. Gettin' paid big bucks like them too, you never know...
On the other matter. I doubt it. I haven't seen 'bots posting on FL much, but I definitely have on other web forums. Those posts are truly strange and funny and scary all at the same time. A few of those might be convincing to some, but usually obvious. It's easier to spot the bots if you are really good at the English language because you can tell when it's just a foreign language speaker's problems versus the odd expressions that AI's come up with.