I've recommended Telegram in the past and I continue to recommend it. If you need a way to communicate in a group or with another person in private, it is (IMO) the best way to go.
The GUI is smooth and easy, the privacy settings are simple to figure out. All you need is a telephone number to set it up. It does not have to be your personal phone number - Although, that's just fine too! You can set up an account with a temporary/disposable number, a number from Google Voice (not connected to your account) or with a number from a burner phone.
Telegram has a desktop version for Windows, Mac and Linux. It also works on iPhones, iPads and Android devices. You can also add it as an APK on Android from both F-Droid and APKPure (reputable APK sites) if it becomes unavailable on Google Play.
It's free and an excellent way to add some privacy to your social media.
If you need help with the download or the privacy settings, give us a call. Or check out the web version of Telegram and contact either Tim or Joy on Telegram!