Deleted my account there a year ago after it started sending me lots of questions of type "what are the first signs that you have illness X" where X varied from lyme disease to ebola. After finding that I match all the known diseases, I decided that this BS was not really worth an account there.
SO is so much better in terms of content quality - the amount of BS stupid questions on Quora is just hitting over the roof
I also tried to find a way to delete these topics from my feed but there is just no such functionality.
I deleted Quora after i got emailed an article offering advice for how to date white women if you're an Asian man.
I don't mind the idea that I need an account, since the trade-off seems to be no ads afaik.