American Express found another way to convert social media to cardholder transactions at the SXSW conference using the still-private Smart Offer API. Amex's “Sync. Tweet. Save.” social marketing promotion positions the credit card for the social media generation beyond membership points.
If you're interested in learning more about the new Google Wave platform and API we covered last month, then take a look at this new post on the Google Wave Developer Blog from Google's Pamela Fox. It discusses a recent Wave API hackathon that occurred shortly after the Google I/O conference.