Yesterday American Airlines sent end of year review emails. I wrote about how few miles I earned from flying 100,000 miles and how scarce complimentary upgrades have become for someone like me. The airline encouraged members to share their activity via social media, embedding links to do so.
Members who took them up on this also posted their frequent flyer number and e-mail address. Oops. American is now telling members they need to delete those posts and monitor their accounts in case all their miles are stolen.