I’m starting to learn the way this is done, and have come to a new conclusion — any comment that doesn’t explicitly show thought about the post it’s responding to, or other comments responding to it, unless it’s made by someone I know that I know, will be marked as spam. “Nice post,” or the like from strangers aren’t going to see light of day, and will be reported to the appropriate databases. Comments are here to continue exploring the thoughts in the posts, or to be a connection between the participants in it.
So, if you’re not someone I already know, and you want to make a connection with what you find here, then say something with even a little bit of substance. Otherwise, I’m going to assume that this is from a spammer and, possibly, machine generated.