Twitter seems to be experimenting with different names for their Favorite feature with select users.
These users are seeing a different name for this feature. Some are seeing Like option while the others are seeing Star option.
@favstar see screen capture twitter.com/eyegooner/stat…
— eyegooner(@eyegooner) October 22, 2012
In both the cases, the icon with the option is a Star.
Twitter has declined to comment on this test drive though it would not be surprising if they would change it to Like in the future.