I'm obviously way behind the times here, not being a Twitter fanatic, but thanks to the domain name industry, I've just noticed a new development on the short message site: promoted tweets. Perhaps Twitter has been doing this for months and I've just not seen it…
Today, I noticed one American registrar using these, as well as .XXX registry ICM.
According to Twitter's help center, promoted tweets will stay at the top of a search page used to display all tweets related to the promoted search term. And it works. For example, the .XXX promoted tweet that I can see now sits at the top of my #icann search column in my (excellent) Twitter client Tweetdeck.
Looks like Twitter's actually got around to selling stuff, and promoted tweets comes across as a good idea and an unobtrusive way of doing advertising.