Looks like there is a new industry of lawyers harassing forums for posting copyrights information. Looks like they file lawsuits ask for $150K in hopes to settle out of court. Know your rights. In most cases it's fair use if you only post a few lines of an article. I think summarizing the article in your own words and providing the link would be the way to go.

Here's a link for more info:
http://www.eff.org/