In one episode of the Durarara!! show(and presumably in the novels), Yumasaki Walker begins to fantasize about adopting a foreign green-haired girl with whom he'd have "adventures". Karisawa Erika then jumps on his reference and asks him if he is referring to "Yotsuba&!". She literally says Yotsubato without it being censored or a parody product-placement, not unlike them referring to Dengeki Bunko by it's true name.
