In response to WhatsApp founder Brian Acton, outspoken tech giant Elon Musk announced that he was joining the #deletefacebook movement, amidst backlash from privacy advocates over the revelations about the Cambridge Analytica data-mining operations. On Twitter, Musk responded simply, "What's Facebook? I didn't realize there was one. First time I've seen either." The pages for SpaceX and Tesla were deleted from Facebook shortly after the tweets.