Apparently you can clear the folder on the left side where it says "Conversations" and hit the trash can next to it. Then you just delete a page and it will delete all of your messages. It cleared all 2200 of mine
Headed to the Ted today. This will be the next to last time I'll see Chipper play in person.. Kinda sad but also excited. Hopefully Sheets can give another outstanding start on the mound and the Bravos can bring one home.