After Musk tweets 'Use Signal', unrelated stock with similar name surges 1,100%
After Elon Musk endorsed encrypted messaging app Signal tweeting, 'Use Signal,' an unrelated US company called Signal Advance saw its shares jump 1,100%. Signal and Telegram are seeing a sudden increase in demand amid changes to WhatsApp's terms of service. WhatsApp has asked users to agree to let Facebook and its subsidiaries collect user data, including phone numbers and location.