Per day, how many filtered photos should brands be posting on Instagram? It’s hardly a science, but one-to-two pics per day will keep the yawns away, but not overwhelm your followers. So Michoel Ogince, director of platform & product strategy at Big Fuel Communications, told attendees of OMMA Social on Tuesday. Unfortunately, measuring the success of such efforts is the tricky part, according to Ogince. Presently, there is no way to measure, say, how a couple of ice cream close-ups on Ben & Jerry’s Instagram page drove (or didn’t drive) in store sales. Ever the optimist, Ogince is confident that Facebook is going to implement changes so advertisers can reliably measure the entire “360 degree” purchase funnel.