Not entirely applicable to forum reading.. but a lot of it does. People should read this and self-evaluate themselves in how they interpret posts and items posted in discussion forums. The simple 'how do you know..' evaluation (even without directly asking that to the poster) usually tells you boatloads
http://lifehacker.com/5950871/how-to-spot-truth-in-the-sea-of-lies-rumors-and-myths-on-the-internet
http://lifehacker.com/5950871/how-to-spot-truth-in-the-sea-of-lies-rumors-and-myths-on-the-internet