I like that some are very specific and will have only posts of one topic. Those are easier to follow and I don't necessarily have to post there, but I like to have a look around.

Yes, I agree that the very specific communities are the easiest to follow. I also take a look every now and then to see how other people go about the communites and posting.

Thank you for the information about reblogging and posting, I really appreciate it! :)