It turns out that baseball blogs do matter:
Major League Baseball confirmed Thursday that it is investigating if Los Angeles Angels closer Francisco Rodriguez doctored the baseball during two appearances against the Rangers this week, the Dallas Morning News is reporting.
A website, The Cheater's Guide to Baseball Blog, accused Rodriguez of having a substance under the bill of his cap and using it as he closed games Monday night and Wednesday afternoon.
Here's the Cheater's Guide post in which current USS Mariner co-author and former Baseball Prospectus writer Derek Zumsteg suggests that Rodriguez was cheating.