How did they even get a link to a single answer? I’m trying to share a different answer and Quora is trying really hard to prevent it.

EDIT: I figured it out and feel like a total doofus. The intuitive UI flow is to share to Facebook, grab the URL, dig out the relevant bit, and URL decode it (/s):

    https://m.facebook.com/login.php?skip_api_login=1&api_key=136609459636&signed_next=1&next=https%3A%2F%2Fm.facebook.com%2Fv2.8%2Fdialog%2Fshare%3Fchannel%3Dhttps%253A%252F%252Fstaticxx.facebook.com%252Fconnect%252Fxd_arbiter%252Fr%252FMmH55ZI0Z2G.js%253Fversion%253D44%2523cb%253Df172009273f7fca%2526domain%253Dwww.quora.com%2526origin%253Dhttps%25253A%25252F%25252Fwww.quora.com%25252Ff19f10ae593154c%2526relation%253Dopener%26redirect_uri%3Dhttps%253A%252F%252Fstaticxx.facebook.com%252Fconnect%252Fxd_arbiter%252Fr%252FMmH55ZI0Z2G.js%253Fversion%253D44%2523cb%253Dfed3dc98298c12%2526domain%253Dwww.quora.com%2526origin%253Dhttps%25253A%25252F%25252Fwww.quora.com%25252Ff19f10ae593154c%2526relation%253Dopener%2526frame%253Df2f7e2a89e66c68%2526result%253D%252522xxRESULTTOKENxx%252522%26display%3Dtouch%26href%3Dhttps%253A%252F%252Fwww.quora.com%252FWhat-are-some-of-the-worst-academic-papers-ever-published%252Fanswer%252FHenry-Brice%253Fch%253D1%2526share%253Dfb45ccda%2526srid%253Dvxoy%26client_id%3D136609459636%26ret%3Dlogin%26sdk%3Djoey%26fallback_redirect_uri%3Dhttps%253A%252F%252Fwww.quora.com%252FWhat-are-some-of-the-worst-academic-papers-ever-published%252Fanswer%252FHenry-Brice%252Fshare&cancel_url=https%3A%2F%2Fstaticxx.facebook.com%2Fconnect%2Fxd_arbiter%2Fr%2FMmH55ZI0Z2G.js%3Fversion%3D44%23cb%3Dfed3dc98298c12%26domain%3Dwww.quora.com%26origin%3Dhttps%253A%252F%252Fwww.quora.com%252Ff19f10ae593154c%26relation%3Dopener%26frame%3Df2f7e2a89e66c68%26result%3D%257B%2522error_code%2522%253A4201%252C%2522error_message%2522%253A%2522User%2Bcanceled%2Bthe%2BDialog%2Bflow%2522%257D%26error_code%3D4201%26error_message%3DUser%2Bcanceled%2Bthe%2BDialog%2Bflow%26e2e%3D%257B%257D&display=touch&locale=en_US&_rdr