Check Twitter for bargains - WSJ.com

Businesses from your preferred airline to your favorite cafe are using Twitter to trumpet last-minute discounts and giveaways. You, too, can get looped in to these immediate and often exclusive deals.

Users of the social network (Twitter.com) can sign up to "follow" stores or clubs they like. Messages, or "tweets," from businesses, like those from individual users, are limited to 140 characters...