So if you’re the world’s largest public corporation by revenue, and stockholders, journalists, bloggers and pretty much everyone under the sun is watching what you’re up to, astroturfing is a disaster waiting to happen – especially if you were caught doing something similar back in 2006.

But that didn’t stop Wal-Mart from setting up a fake community group to drum up support in Chicago, where the company is gunning for a second store within city limits.

When the Chicagoist blog received a series of pro-Wal-Mart comments from unknown screen names in response to various posts, blogger Kevin Robinson decided to investigate. He discovered that, with the help of PR firm Serafin & Associates and the Chicagoland Chamber of Commerce, Wal-Mart is behind the phony advocacy group, “Our Community. Our Choice,” which was linked to the blog comments.

Wal-Mart and its associates have every right to plea the corporation’s case to the people of Chicago. And the citizens do, too, if they’re legitimate. But establishing a fake community group that professes to stand for residents and their interests is undoubtedly devious and a tactic no PR firm or brand should use.