Instagram jumped on that bandwagon this month with its first sponsored post, which has drawn the inevitable chorus of disapproval but also a surprisingly high rate of user participation. Company CEO Kevin Systrom tells GigaOms Roadmap conference that over five percent of all ad impressions turn into Likes — an impressively high number by online advertising standards. Systrom stresses that Instagram is taking it slow and working with a limited group of advertisers in order to keep the standard really, really high.