Missing on Saturday night, at the third birthday party for Flickr at the Yerba Buena Center in San Francisco: Stewart Butterfield , the founder of the photo service. Butterfield, now an exec at Yahoo, blamed nightmarish traffic and parking , and colleagues were overheard attributing his absence to jetlag, after recent Asian foray. But not so jetlagged that he would miss the social event of the season, a fundraising gala for the X Prize at Google's Mountain View headquarters . Captured here, Butterfield and his wife, Caterina Fake, in a photo Esther Dyson posted to the web . Damn that Flickr. Can't even skip the company party, these days, without being caught.