It depends on the headline - if it is a generic headline about a topic of interest, I'll read the comments, as the discussion usually covers the topic well. If it is a blog post or article, then I read the article first, so I get my own unbiased view of it before diving in. The one outlier is links to results from a medical study, I rarely read those comments, because they are typically just skeptical negation of the study, so I just draw my own conclusions with my own dose of skepticism.