Appearing on the side of a twitch stream; a bar graph or bar meter that displays the energy or "turntness" of one or more select subscribers. Maybe "judges".

The meter is controlled by a virtual sliding switch or maybe a knob on a viewers twitch panel.

The viewers avatar is displayed under the bar meter to show who's cranking the like meter

or

Every viewer has access to the sliding switch and an average of each input is implemented into the like meter displayed on screen

For added flair if the meter maxes out, some kind of animation plays