Snapchat, the wildly popular messaging service that lets users send self-deleting photos to one another, has exploded in volume over the past few months, now moving upward of 150 million photos through the service on a daily basis. That’s a 3x increase in just four months, founder Evan Spiegel said at our D: Dive Into Mobile conference on Tuesday, a massive jump by any measure. (Here’s some perspective: Facebook’s Instagram, one of Snapchat’s closest competitors — though a photo service that strives for permanence over Snapchat’s ephemerality — moves around 40 million photos through its service on a daily basis, according to Instagram’s press site.) The growth is good news indeed for Snapchat, which just closed a $13.5 million round of funding led by Benchmark Capital in February. Great volume!