The most popular API, in terms of mashup count, is far and away the Google Maps API, which accounts for 41% of all mashups. But when it comes to the most popular pair of APIs, Flickr and YouTube mashups are the most common. Not to be outdone, Google Maps joins Flickr in a near second place.
A competitor created an export tool for Flickr ex-patriots, so the photo sharing site shut down the Flickr API developer key. The Google Plus developer page makes some wonder if the "real" Google Plus API is coming soon. Also: questions about the Google Safe Browsing API, free cloud database and 15 new APIs.