Flickr owner SmugMug emails subscribers with an urgent request: help us find more paying users

When in April of last year, the photo-hosting service SmugMug acquired the photo-hosting service Flickr from Verizon’s digital media subsidiary, SmugMug CEO Don MacAskill said he was committed to breathing new life into the service, calling it “core to the entire fabric of the Internet.” MacAskill didn’t reveal at the time how much SmugMug —…