My first impression is that this [person] is doing something awesome [online]; and that I wish the [organization] would find a way to leverage [their] passion for outreach/recruiting purposes (i.e. bring [them] into the fold officially rather than keep [them] at arms length); but that might just be wishful thinking.
My professional opinion is that your responsibilities as a communications adviser to monitor this particular situation ends at advising [them] to read the TBS guidelines and remind [them] of [their] responsibilities under the Code of Values and Ethics (and any other unique codes of conduct within the organization).
'paranoia' by katiew
My reason being that you may be able to police [their] activities now, but if everyone in the [organization] started blogging tomorrow could you scale that approach to your entire organization? Trust in the professionalism of your workforce is the only thing that scales across the entire organization and the only thing that pays dividends in the long term. [This person] is obviously engaged in [their] work, does the organization really want to risk alienating [them] over this?
As you may or may not know I've been blogging about the public service as a public servant for the last 4+ years without major incident. As long as [they are] willing to accept the consequences of [their] actions, whatever they may be, I see no harm in letting [them] continue.
PS - I only got one Guerrilla Renewal submission, here it is, and it is awesome.