Allow me to make a brief public service announcement: I follow Mitt Romney on Facebook because I want to know what his campaign is up to online. I also follow President Obama and a number of other politicians. But, to paraphrase the standard Twitter disclosure, liking is not an endorsement. Anyway, the image at right was sent to me by a friend today. If you, too, would like to avoid be rolled up in a social promotion for a politician's site on Facebook, go to Account Settings in Facebook. Select the "Ads and Friends" section under "Facebook Ads." Choose the option "no one" in the drop-down menu. Save changes. That is all.