Read this: https://bitcointalk.org/index.php?topic=1684035.0

Just put some effort and thought into your posts like you did this one. Making sure a post is 75 characters long doesn't magically make a post constructive though. In fact, just trying to hit the 75 character count usually has the opposite effect because people tend to stretch out their answers unnecessarily. Also, when all of your posts are around 75+ characters or one or two lines it's very easy to spot a pattern. There's no good reason why any users posts should follow a pattern or all be one or two sentences but this seems to be a habbit of Sig spammers because they somehow seem to think that two sentences is the magic number that suddenly makes a post constructive or not spam which isn't the case.