New York (CNN Business) After several days of largely shrugging off news about a growing Facebook advertiser boycott, investors now appear to be taking notice. Twitter TWTR The dip comes after Facebook's stock ended Friday down 8% on news that Unilever, the massive household goods company, would halt advertising on Facebook andfor the rest of the year. The stock moves highlight a new uncertainty about just how much the boycott could dent Facebook's ad sales machine. Much of Facebook's ad revenue comes from small and medium-sized businesses, potentially insulating it from too much of a revenue shortfall from the boycott. But some brands like Starbucks do rank high on the list of biggest ad spenders on Facebook, according to estimates by Pathmatics, a market intelligence firm.

Source: CNN June 29, 2020 16:07 UTC