Well, I'm not a fan of Buffett's, but I guess I never suspected him of indulging in that kind of behavior. But it does bring up an interesting point, how is such a conflict of interest dealt with. The reason I think this may just a rumor is Buffet does have a set of criteria he invests based on. And I'm not sure Dow Jones qualifies.
Buffett is a major investor in the Washington Post.