Oprah is out plugging the Surface for Microsoft, stating that she is buying several of the devices as gifts.
However, in sending out that specific tweet, she, or whoever was running her account that day, used a somewhat embarrassing service to communicate.
As we, and others have noticed:
Yes, this is amateur hour.
Oprah have legions of fans, making her an effective marketing channel for Microsoft. Except for when the narrative around her promotion is tossed on its head by a foolish, and utterly avoidable mistake.
That shows why people who manage social media accounts should be tech savvy, not just marketing savvy.