Corporate America's discovery of blogs, and their sometimes less-than-savory co-optation as marketing tools, is the topic of a Boston Globe piece from early in the week. With a growing number of businesses using blogs to help promote their products, sometimes in ways that are not very transparent, who or what is behind a blogger's pitch is getting hard to discern, the Globe writes. It points to several examples and cites disclosure concerns that have prompted the Federal Election Commission to take notice.