Owned by Microsoft.
Collects and uses data for business operations, including using data to "personalize your experiences, "including Ad targeting and third party products.
Allows direct messaging by group added to or joined.
Able to monitor
What GroupMe says, "A Home for All the Groups in Your Life. Family. Roommates. Friends. Coworkers. Teams. Vacations. Greek Life. Bands. Faith Groups. Events."
What SGS says, "This app is becoming mandatory for teams, squads and classes in the educational and sports environment. Being a Microsoft product, it has better security and monitoring capabilities. Be aware that this app, just like most apps, could be used by adults to gain trust by your kids. Continue to monitor if you choose to use this app."
Opportunity for exploitation, pornography, sexualization, objectification