You're missing the fact that the only way to interface with it is by voice. If you want to send a message to another person, you need to speak it out loud. If that person is nearby, it's not really telepathy, it's just talking.
Google glass isn't going to get a bunch of apps or options, because nobody is going to go around saying things like 'ok glass scroll left', 'ok glass install/open instagram', 'ok glass show me his profile'.