They didn't. It's just now typed as :thumbs:, which would be :thumbs: instead of :thumb:. Now if only it would show up as a bunch of letters instead of :thumbs:, how exactly do you show someone how to type :thumbs: when :thumbs: turns up as :thumbs: instead of...oh nevermind.
: T H U M B S :. Without the spaces.
:thumbs: