For example: On Twitter I can use the @ sign and then the person I am replying to will receive a notification. On Facebook this is also true. The @ sign will pull their name (if we are friends or conversing in the same group). On Bubblews we use the & sign in front of the username. I'm interested because I want to un-follow the hubs I have interacted on after the initial exchange. But, I don't want to miss messages. The list of Hubber friends I follow and the amazing hubs they create is getting longer and I don't have time to revisit every hub every time there is another comment left on it.