A version of local search has existed on Twitter for some time: asking your followers for local recommendations about places to stay, things to do and so on. One can also use Twitter search itself, though it’s very hit and miss in terms of the quality of results. And there are also the third party search engines that use the Twitter API. Yet those typically produce the same uneven results.
But in what is a first (to my knowledge) Idearc’s Superpages has brought true local search to Twitter through Twitter.com/sp411. Twitter users can now conduct searches of the Superpages database and get results as direct messages on Twitter to their local queries. (They can also retweet and share them, which makes it that much more interesting.)
The rest of this post is at Search Engine Land.