Synapse is a collaborative platform. There are a couple useful features you can use to communicate with others on Synapse: discussion forums and teams.
Discussion Forums
Discussion forums are a space to communicate with others, similar to a message board. The discussion forum is visible to users who have access to the project.
Learn about discussion forums here.
Teams
Teams allow you to easily manage groups of users to control access to projects, communicate with colleagues, and participate in challenges.
Learn about teams here.