Ubuntu Networking :: No Trivial Option For Folder Sharing Over Internet?

been looking for a easy way for simple users (newbies) to share folders over the internet with friends. I found almost nothing about it, in both Windows and Ubuntu, as people usually recommend online sharing (as dropbox and Ubuntu One, which is not what I ask for) or ssh, ftp and related, which are usually not trivial to set up for simple user and you need to install a nice GUI for the client.Why isn't there a simple way as a right-click menu option, then choosing some user/password and having it available over some iport? Something like local network file sharing.This seems like an incredible tool to have.