Social learning platform A Cloud Guru helps cloud professionals learn and prepare for AWS certification exams. The platform grew to 40,000 users within 6 months, and its founders attribute that growth to their serverless approach that has influenced the mindset of the entire company.
For over a year developers have been asking for an API from Quora, the Q&A site that has recently exploded in popularity. The company had been waiting until there were "enough users and content on Quora." A browser extension outed the interface and now there is an officially released, but still alpha Quora API.
Since Bebo brought its Facebook Platform-compatible API out of closed beta a few weeks ago, as we reported in this post, the initial growth shows a steep curve from about 50 launch partner applications available before Jan 12th to 714 on Jan 26th.