One of the challenges with building an application these days is the number of dependencies that application will actually have on other applications. Ideally in order to know how that application will actually perform application developers would be able to test their application against the application it depends on running in production. The odds of that happening, however, are slim to none, especially if that other application is running as a cloud service that has to be always available to end users.
Topsy, the Twitter search indexer that recently raised another $15 million, now lets users zero in on tweets mentioning videos. According to Topsy, the trending videos are the "most popular videos shared by influential users within the first 24 hours of their release." The feature is also available in its Topsy API, though currently undocumented.