By Brad Reed Twitter CEO Elon Musk on Friday angrily lashed out after seeing his new company suffer a massive drop in advertising revenue — and then had to see his own platform offer a fact check to his claims. In a tweet posted Friday morning, Musk complained that “Twitter has had a massive drop in revenue, due to activist groups pressuring advertisers, even though nothing has changed with content moderation and we did everything we could to appease the activists.” Musk added that this situation was “extremely messed up” and he accused the activists of “trying to destroy free speech in Ameri…