This playbook is focused primarily on on-domain communities. As you design your community, you should consider the benefits of interacting with your customers on 3rd party sites:
Many high value customers and influencers can be found on 3rd party sites. Consider interacting in these places to:
Be cautious about relying too much on off-domain services to build your community. Not being able to control your own platform and data can cause problems for your community in the future.