Even for someone like me, and I'm as socially naive as they come, social naivety is a very easy thing to spot in web forums.
Have people on other forums taken notice of you because they thought you were socially naive based on your posting? It's something that seems to have shone brilliantly from me on almost every other web forum where I've been active. In the music of online posting, such posts have a distinctly noticeable off-key wavelength.
You post away on a forum, someone takes notice, and you are literally hounded by at least one particular user, because you are naive. Quicker than you know it, you cannot make a single post on the site without this particular person hounding you every time because they do not want people on the site who are naive, as it becomes deeply ingrained in them that it makes themselves and their body of posters look less hale and hearty. This person takes it on themselves to be your very own personal "monkey on your back" that you cannot shake off. At least this is what's happened with me, time and time again.
I'm glad of a forum like WrongPlanet, where I see certain users who are obviously naive, but I can relate to what they say very well.