:WP:SOURCES states that acceptable sources are "... reliable, third-party published sources with a reputation for fact-checking and accuracy"  and that "Tiny-minority views and fringe theories need not be included, except in articles devoted to them."  WP:QS states that sources to be avoided include those which "... rely heavily on rumors and personal opinions."'.  If there are any sources from mainstream news organisations that comment on the "horsemeat as corned beef" theory, then by all means use them.  I had a look to see whether any of the main news outlets used Toluna polls in their articles and could find none (whereas MORI, Gallup and YouGov are all fairly well-respected) I apologise for the "vandalism" revert, but when sources have been challenged, simply reverting without any explanation, I tend to assume the worst. -)   JediLofty