I had an idea for Reddit during a fever the other night.

Sometimes when I read posts I"ll agree with certain parts more than others, but my upvote still reflects the entire post. So I thought, what if I could highlight certain parts of the text and then upvote? Those parts of the text would get a faint orange behind them. As more people highlighted and agreed with the same areas those segments of the text would become darker and darker. This would let you see what parts of the text were popular at a glance. Some other things that could lead from this idea:

The same process for downvotes. There would be blue parts and controversial parts could be purplish (orange and blue?).

Scanning longer post would be easier if you didn't want to read the whole thing.

It could be used creatively to highlight certain segments of text to reveal humorous messages.

I have no idea if this would even be feasible but I had a fun time thinking about it.