I always check the comments of the person making those simple comments. It's pretty obvious that they are spamming when there is 40 identical comments in 30 minutes. Sometimes the comments are slightly different but it's pretty easy to see through. I almost made it a year without flagging anybody, but these spammers need to be stopped, or at least have their penny taken away where it can be.
The key is to always check and make sure it's not someone who may not speak english as their primary language and is actually just trying to be nice. And to confront them on one of their posts somewhere. I have told this to a few people and they just didn't realize what they were doing and stopped once they were confronted.