Yeah virtue signaling is mostly a Facebook/Twitter thing.
YouTube too. Just pick any Sargon of Akkad video at random, it's almost guaranteed to be about either "virtue signalling", "moral busybodies" (i.e. the people mostly engaging in virtue signalling) or "cultural Marxism".
Attending a protest or donating to charity is relatively risky and expensive in comparison to just feigning outrage, retweeting slogans or changing your avatar.