Facebook bans Google+ ad
Found on CNet News on Saturday, 16 July 2011

App developer Michael Lee Johnson, conscious of the need to be big on Google+ or be nobody, wondered what the best way to levitate his Google+ circles might be. He hit upon a fine idea: he placed an ad on Facebook. It was a simple thing that was headlined: "Add Michael to Google+."
You're not guessing what happened with the ad, are you? You know what happened, don't you? Facebook didn't, according to Johnson, merely erase this heinous horse of Troy from its pages. It reportedly banned all his other campaigns too.
Thank you Facebook. Thank you for making that little ad, which millions of your users would have never seen, hit the news. Use this chance to learn about the Streisand effect.