What's the legality of such an idea (can this be considered harassment? Is the site liable in any way for what the users do with it?). I can't tell what API the

What's the legality of such an idea (can this be considered harassment? Is the site liable in any way for what the users do with it?). I can't tell what API they are using (Twilio?) but it looks like an excellent application. Edit: Never mind - the platform is from Revolution Messaging (http://revolutionmessaging.com/services/mobile/ http://revolutionmessaging.com/services/mobile/)