The main two things to watch out for are copyright law and defamation. Do not post entire articles in our forums as the author owns the work and it is copyright violation. Post no more than 2-3 paragraphs and include a link to the article you wish to cite or discuss instead. Also, be aware that you could be liable for what you write on the Internet and be the target of defamation lawsuits. So avoid non credible or unfounded attacks or harassment of people, businesses or groups.