"Instagram Demographics" so much opportunity. Who's using Instagram? Who's using Instagram? Who's using Instagram? so much opportunity. user base Instagram Business Insider 90 percent of Instagram’s 150 million so much opportunity. over 90% of Instagram users are under 35 Business Insider Business Insider resonates well Business Insider according to a mid-year story from Business Insider young network 90 percent of Instagram’s 150 million so much opportunity. so much opportunity. Who's using Instagram?