Leftypedia was an online collaborative encyclopedia that inspired the creation of ProleWiki. As of 2022, their website has become unavailable.
The primary difference between ProleWiki and Leftypedia is that Leftypedia sought to be a "big tent" "catch-all leftism" encyclopedia, whereas ProleWiki aims to follow the line of scientific socialism, that of Marxism-Leninism.
Without an emphasis on scientific socialism, one can fall into the utopian trap of anti-authoritarianism, and being tricked into supporting imperialist propaganda against "Actually Existing Socialist" states.