The informal information can be so intuitive, emotional, personal, honest and subjective that it is very difficult to get them from the formal media. In this paper, we demonstrate a multimedia informal communication support system whose basic architecture is a combination of a wearable computer, a see-through head mounted display, a bone conduction speaker, and a 3D-pen. The user can create a "multimedia" graffiti such as a handwritten memo or a voice memo and place it in a real-world "multimedia" context such as at a certain location (by GPS), environmental sound, the real object (by RFID) and so on. The multimedia informal information is thus shared with others on the peer-to-peer self-organized network. We demonstrated the prototype system and conducted a preliminary evaluation.