Who guards the guardians? Quis custodiet ipsos custodes and all that. The Daily Caller has the answer:

Four of the world’s biggest tech platforms have working partnerships with a left-wing nonprofit that has a track record of inaccuracies and routinely labels conservative organizations as “hate groups.”

Facebook, Amazon, Google and Twitter all work with or consult the Southern Poverty Law Center (SPLC) in policing their platforms for “hate speech” or “hate groups,” a Daily Caller News Foundation investigation found.