The pillow fight just started 30 minutes ago, and the pictures are already coming in. Part of World Pillow Fight Day, this is the third consecutive year the feathers have flown around Union Square. Were you there? Don't forget to tag your pillow fight pics with "Gothamist" at Flickr. UPDATE: Some locals aren't too happy with the feathers blanketing Union Square -- National Geographic has a Green Guide to pillows, which may explain why. For......