JS_Harris - 6:29 pm on Mar 14, 2010 (gmt 0)
Business model? Twitter doesn't have one. I suggest they start becoming a clearinghouse for coupon codes and become an affiliate of the various companies listing codes. A bot twitter account could then insert coupon based offers into the twitter stream that users may not hate to see. "Special limited time offer, big brand widgets are 20% off with code from example.com".
If twitter limits the twitter feed to 1 such coupon every 10-15 minutes the system may support it and shoppers may actually stay on twitter to spot the deals.
Just an idea.