He forgot the data synchronization system, except that Dropbox pulled that off. Also the "social browsing", "see who else is visiting this webpage", except that

He forgot the data synchronization system, except that Dropbox pulled that off. Also the "social browsing", "see who else is visiting this webpage", except that Facebook is after that one already. Also the "alert me if a website has changed", well, I don't know if that really exists in a usable way or not.