We can confirm that is no longer possible to share your listening activity through Facebook. We're always testing things in order to improve Spotify, so we may add or remove some features.
However, there are other ways that you can check your listening history. At the end of last year, we gathered some playlist and info for eligible users so they can check their listening habits during 2017. You can find your personal Year in Music at 2017wrapped.com/ . You can also access personal playlists at https://open.spotify.com/view/2017-page.
Let us know if you have any questions. Have a great day!