One day, awhile ago, I received a message saying something about I had reached my maximum number of messages per day and would have to wait until tomorrow to continue sending more. The funny thing is it was only 11AM and I felt like I hadn't even sent very many that day. A couple friends of mine recently said that they received the same message.
@mark or anyone else who may know the answer, is there a cap on messaging and if so what is the number?