Fox is a Rupert Murdoch media group which is known for using sensationalist techniques to draw more viewers. In this regard, it may incorporate more focus on controversial matters which involve tabloid type issues of sex, gossip, heresay, opinion, etc., versus a straight reporting of just the facts and allowing the viewers to make up their own minds. The entire motto of "Fair and Balanced" for Fox's supposed news reporting syle was manufactured by Fox in an effort to paint themselves with more credibility from a journalistic perspective. You will note that many of their reporters and commentators are just more animated, opinionated and outspoken than their their traditional counterparts from years ago.
The "Fox Effect" is what brings other news outlets to have to lower certain journalistic standards in order to compete with audience that Fox is drawing. People are fascinated by controversy and dirt. But is it really news? There has been a big trend to fill the news with more celebrity events and gossip and that would be "The Fox Effect". In some ways, it makes the news more entertaining...but some would argue that the news is supposed to be about informing with the facts and not titilating with rumor, speculation, or conjecture.