On the face of it, you might think that the QAnon conspiracy has largely disappeared from big social media sites. But that's not quite the case.

True, you're much less likely to find popular QAnon catchphrases like "great awakening," "the storm" or "trust the plan" on Facebook these days. Facebook and Twitter have removed tens of thousands of accounts dedicated to the baseless conspiracy theory, which depicts former President Donald Trump as a hero fighting a secret battle against a sect of devil-worshipping pedophiles who dominate Hollywood, big business, the media and government.

Gone are th...