A few friends and I used to add music to a playlist of our, we have been working on it for a couple years now and today while my friend was adding music it went empty all of a sudden and I was wondering if there was a way to get a log of the songs that used to be? I highly doubt any of us deleted the entire playlist. Either way here's the link to what used to be a massive playlist: https://open.spotify.com/user/22kgimwksavtnli7cbijzn2ki/playlist/2rHctvd9nj93xCgsIu3zSv
It's not cool that your collaborative playlist was removed. Collaborative playlists are editable by everyone who has the link, so I'd recommend making a new collaborative playlist and only share it with people you trust. Also, maybe Spotify can help you recover the tracks from your playlist. Pop them a message here, or on Facebook or Twitter on @SpotifyCares.