gCube social facilities: social networking library

The gCube social networking facilities manifest in a number of applications made available through a Web Browser conceptually close to the common facilities promoted by social networks - e.g., posting news, commenting on posted news - yet adapted to deal with large scale collaboration and cooperation on comprehensive scientific products, data sets, theories and tools. The Social Networking Library is a "bridge" between the gCube social networking applications and the NoSQL Datastore supporting the applications back-end. By abstracting over the Datastore provides with all the required logic to support publication of posts, post replies and/or likes, as well as the "smart retrieval" of these posts per user or VRE, i.e., timelines. Moreover, it supports selective notifications on the activities performed by users over these Posts.