I would distinguish between the job board, similar to what LinkedIn provides, versus a full solution related to the recruitment system. The job board can be used right now by departments and agencies. In fact, we encourage it. If it increases the reach of a job advertisement, then that's great. There are no barriers for departments to be able to used LinkedIn and some of the other social media sites right now.
On April 1st, 2019. See this statement in context.