https://celebrityinsider.org/ariana-grande-is-back-on-snapchat-after-negativity-forces-her-to-take-a-break-from-twitter-and-instagram-172783/
https://en.wikipedia.org/wiki/ICloud_leaks_of_celebrity_photos
The above illustrate how making decisions on social media can have lasting effects. Read about what happened and consider: How can a single social media decision create controversy for years?

Essentially a glorified WhatsApp or group chat, I have experience using Slack with different jobs, particularly when communication can be random and content needs to be organized into subgroups. What I like about Slack is that unlike WhatsApp or others, which link to your contacts and function largely as social apps, Slack requires password access to a group, and supports interchange of a variety of media types. https://slack.com/