An add on that works with many popular file, photo, video, text sharing applications like flickr, facebook, youtube, twitter, gmail (and other mail – but you can use it with gmail to get all these alerts via email).
It’s a great way to communicate with friends who you aren’t able to see often. I “buzz” with friends from Israel all the time in Hebrew… it’s a great thing!
it’s just a way to have a conversation with someone in public.. if you’re gonna have a conversation with someone, why do you have to do it in a way that your entire list of contacts can see it? i think it’s completely pointless!