I'll fess up - I follow some brands on twitter. I like a discount or a coupon as much as the next guy, and I also like to keep tabs on brands that I am truly interested in. I don't generally interact with these brand accounts, but I have on occasion.
One thing that I notice brand twitter accounts doing is retweeting positive messages about their own brand. For example, if a random twitter user sends a tweet saying "just had a great flight on @delta" it is common practice for Delta to retweet that. It's a little self-promotion, but it's generally accepted in the twitterverse.
this retweet by Mandalay Bay (image at right). I checked the clock and saw that it was 11:49am. That would make it 8:49am in Las Vegas. I was just a little appalled at the thought of drinking a Guinness and eating BBQ at 9am. I applaud the original poster for his iron stomach, of course.
It was only then that I noticed the little time-stamp of "12 hours ago." There is nothing wrong with beer and BBQ at 9pm. That's perfectly normal, even a little tame by Vegas standards. In the haste to promote their brand and give a little self-back-pat, Mandalay inadvertently made the original poster look like someone who really enjoys his Vegas. While this case is a little amusing with little harm done, it's always best to be careful what and when you retweet. Just because you walk in at 830am with a list of mentions, it always helps to use a little common sense when you decide which ones to re-share with the world.