i'm from Ukraine, so i use VK, and though i'm mostly against of torrents and copyright protected files, i find all VK's advantages, that are stated here, very useful.
considering that now, where there is a free
iPhone app that makes using the network very simple, it also allows to listen your private playlist as well as playlists of all your friends, as if the music in on your Apple device!) it's great - infinite music library in your device (provided that you have an internet access)
so, yeah, that's how things are done here - you want it you get it, and as you understand, no bothering about copyright, accept a little warning from VK administration (that's what actually i don't like about our people)
here's a screenshot of VK music player on my iPod
P.S. there's only 3 possible invitations i can give, so sorry, guys)