Congratulations to your promotion.
An advice from someone who is also leading in his office-job:
It is key that you lead by example, so a minimum personal investment in terms of powering up your account is required for your credibility! As many commented already it is hard to understand that a Head of Communications & Advocacy did not post, comment or power up his own account for months. I also would have thought that all these would be part of such a job role. So please let the facts speak to rebut those concerns!