Koala is a Ruby library for Facebook that allows developers to access the Facebook Graph API, REST API, OAuth validation, realtime updates, and test users. It supports JRuby, Rubinius, and REE in addition to multiple versions of vanilla Ruby.
Yesterday, WhitePages.com announced a new search API that gives developers access to a substantial database of 180 million people, which represents approximately 80% of US adult population and includes 25 million "at work listings".
Twitter yesterday announced updates to its developer platform terms that aim to reign in the use of automation by bad actors "to perform coordinated actions across multiple accounts." Twitter's updated policies forbid applications from posting identical content to multiple Twitter accounts.
Google recently announced a number of changes coming to the Groups Settings API. The changes include deprecating certain properties and combining others. The effective date of the changes is May 6, 2019, but Google encourages developers to start thinking about the transition now.