The concept of attaching notes/summary/gifts/messages/art/etc as a layer on top of websites has been done endlessly. It seems like the main problem is the netw

The concept of attaching notes/summary/gifts/messages/art/etc as a layer on top of websites has been done endlessly. It seems like the main problem is the network effect. Why should I use yet another service if there's not enough scale for it to be effective?