The comparison is even more useless because of a simpler reason: Rails people don't search "ruby on rails authentication" they search "rails authentication."

The comparison is even more useless because of a simpler reason: Rails people don't search "ruby on rails authentication" they search "rails authentication." My guess is that Django and asp.net mvc people search for "django authentication." (My assumption is that google counts a search for "django auth" as a search for Django in trends.) This means that as Rails grows in popularity, "ruby on rails" will decline, since many many developers now know what it is. * However, as Django and others grow in popularity they hang onto all the people searching for "django xyz"