I am a firm believer that any social media strategy should separate a therapists personal "persona" and their professional. I don't think its fair to the clients (whether youth or adults) to blur that line in social media but then when they show up in your personal life somewhere to speak to them about professional boundaries. In my opinion, what is healthy for all parties is to have separate accounts.
As well, I understand that youth or even adult clients may want to interact with their therapist in a particular way, but it is up to an agency to set a particular standard that respects privacy while balancing working with clients where they are at.
I feel we need to be mindful of best practice while we get creative in this digital age.