Can't share to Facebook or Tumblr via web

The option to share stories to Facebook has vanished for me (again; it’s happened before). I’ve tried going into my settings and un-checking and re-checking the Facebook sharing option, with no luck. Also, the share to Twitter option is always available on my feeds, even though I don’t want it to be, and no matter how many times I check the box to add Tumblr as an option, it never works. 

This happens on every computer I use, so I’m pretty sure it’s not just a matter of the cache needing clearing or whatever.


So these are separate shares. The Tumblr share is for when you right-click on a story title. The Facebook share gets turned on under Manage > Friends > Connect to Facebook. The Facebook that under Preferences refers to using that context menu when you right click on story titles.