Definitely agree on the auditing tool - but I'd take it further, and make it a a full-blown feature. Provide the teacher's higher-ups with it (so they can inspe

Definitely agree on the auditing tool - but I'd take it further, and make it a a full-blown feature. Provide the teacher's higher-ups with it (so they can inspect, if needed) and provide it to parents as well, so they can see what the messages are. Maybe event take it one step further and encourage parents to sign up with it as well, so they know what type of messages their kids are getting that their child's teacher considers important enough to send using this medium (perhaps include an email-delivery option for these ones). The basic product is one-to-many double-blind logged communication; don't make it about the exact mechanics of how the conversation is delivered, make it about the logged/safety aspect of it. SMS, email, voice-drop, robo-call, AIM-bot, etc. are all communication media that could benefit from this approach.