I checked the styles and listed the ones that still await implementation of this feature last time I checked.
And, I thought I'd post it here so that people will know; perhaps it might prove useful.
Modular [Prerelease] (Default, Black 2)
Pichu2
Sweet Kisses
Generation InVerse
Snivy's Holiday
New Directions
Simple
Also, vBulletin Default does have the Like button, but its Post Comment button is still shown as a scale (for rep) beside the offline/online status icon and the Report button, instead of the Furret with the speech bubble as seen in most styles. Anyway, if a specific style isn't in that list above, I can confirm that that specific style shows the two Furret buttons, at least for me (or my browser, which is Chrome by the way).
Again, thanks for the cool feature, guys! :D