Yes, you can! As long as you are ‘friends’ with the person you’re sending them to, you can send a picture, video or audio to them via the onoff Network.
At the moment, however, we don't support traditional MMS multimedia messaging.
FYI — the onoff App is waaay more fun if you add your friends. This can be done easily by searching for them on the onoff Network.
To find out more have a look here: How can I find my friends?