I read this headline with the narrator's voice from "Dr. Strangelove" (who had a similar line).
"Each B-52 can deliver a nuclear bombload of 50 megatons, equal to 16 times the total explosive force of all the bombs and shells used by all the armies in World War Two."
I have looked at several other photo hosting services (Smugmug, Zenfolio, 500px, etc.) and while they all do a competent job at hosting photos, it is the communities that have developed on Flickr that I would miss.
Yes, other sites have their own communities, but leaving one for another is like moving to a strange new town that you don't know anybody in.