A new wave of collaboration tools are taking hold in workplaces, particularly ones that value fast and frictionless communication and spontaneous collaboration.
to join: http://bit.ly/appsf18
That link above should allow you to self-enrol. If you email firstname.lastname@example.org I can also add you.
Joining, managing, and creating channels: open and private.
Pin key entries. Describe attached files. #hashtags
Mattermost works well on mobile devices, and has Android, iOS, and Desktop applications.
It is recommended longer pieces be written, or at least copied somewhere, before posting... Word or whatever platform is preferred.