http://privacyy3tsy4mge4qmg4nsid2vnhl7szzupphhkfsxvayx5tl2ztbqd.onion/ublock/index.html
The site owner probably is dumb and doesn’t realize it allows the social media firm to spy on users. ALWAYS block it. For example the official Libertarian Party gets their ideas censored by Facebook, but yet they still allow Zuckborg to leech data off their visitors for the NSA.