From the Daily Mail (London):
The Big Mac has come under attack, after McDonald's became the subject of an outburst of vitriolic hatred on Twitter when critics hijacked a promotional hash-tag created by the fast-food giant.
Opponents accused the burger franchise of making customers vomit, serving pig meat from gestation crates and dishing up a burger containing a finger nail.
One fierce critic claimed he would rather eat his own diarrhea than visit the famous Golden Arches.
Said it before, and I'll say it again: The blogosphere is a kill box for any corporate brand.