what is this GroupMe chat that you speak of? It sends alerts on engagements or something?
GroupMe is a service where you can create a chat via SMS.
There is a well known 'Simcha chat' which sends out texts daily messages of who got engaged that day... They use the GroupMe service. (They set it as a broadcast, meaning only the admin can send messages, so you don't have 2000 ppl sending their stupidity...) Somehow their 'admin only setting' got hacked today, and everyone was getting 100's of messages from all those very mature ppl. So they closed down the chat. They supposedly will be making a new one...