Crew on social media can definitely be beneficial for both parties involved, many airlines see it as a PR asset and manage it well, though of course it does have to involve some guidelines.

To me the policy an airline adopts with regards to this speaks more to the state of the organisation and its investment in recruitment, training, and employee relations, more than anything.

Crew not being trained to manage the airline’s own service standards is often a subject of complaint on this forum, and we have had discussions of some instances of safety related incidents as well, so are we really surprised that the airline may not have a handle on social media policy and just opts for a blanket ban instead?