Facebook said last Friday that it estimates more than 140 million agencies are currently using its family of apps Facebook, Instagram, Messenger and WhatsApp every month, “To find new clients, hire employees or engage with their groups. ” During the company’s first quarter income report call earlier this year, COO Sheryl Sandberg said that Facebook’s top 100 advertisers accounted for only 20% of the company’s ad revenue. “Our advertiser base is more distinctive compared to a similar period over last year,” said Sandberg in April, backing up Zenith’s theory that the surge in social media ad spend is an immediate result of SMB ad investments.