Why does yahoo not post many of my comments on articles?

there are people using foul language, in fact I even read one post that the poster mentioned sex and one of Obama's daughters, and another flat out calling him the "N" word... My posts occasionally go through, but when they don't I ask in a new post why, and they post those... I do not use rude language, am very realistic, and only use information I can confirm. What gives?