Over the last several years, social media has become a critical and central way for businesses to communicate, and market to, their customers. Now, one of the startups that helped spearhead this trend has raised a round of growth funding to expand its horizons. Hootsuite, the Vacouver-based social media management company that counts some 16 million businesses as customers, said today that it has raised $50 million in growth capital — specifically through a credit financing agreement — from CIBC Innovation Banking.