I don't see any purpose for this where DBAs are concerned but some businesses would love it.

Say for example you work for a company like Perkz or Groupon or HotUKDeals whatever. All of your special offers are stored in an SQL Server database, as are the comments and ratings that users give the items. Once an item or offer has had x comments, or x users rated it at 4 stars and above you can trigger the system to tweet it as a 'hot' deal or offer.

When subscribers join up to see what offers and deals you have, your server can start to 'read' their tweets. With a little bit of clever logic the server can link what offers and deals it tweets about to the kind of subjects and products that the subscribers tweet about. E.g. you get a deal in for a 20% discount voucher on some mountain bike retailer, your server 'reads' about your subscriber "Going downhilling with Dangerous Dave on Saturday! Sweet!" picks up 'downhill' as a tag on the mountain bike offer so re-tweets their comment with the voucher details attached.

Doing all this within SQL without having to faff about with writing custom applications to tie SQL in with twitter would be excellent. Totally unimportant to the DBA but awesome for maximizing the effectiveness of a retailer's marketing.