I want a metric of % posts liked. Liking one person is too black/white but if you can like every post, you can measure how many likes per views a thread's OP and the subsequent posts have in addition to making people heros when they posted 50 liked posts (posts that have more than 10% like/view).
This would be fantastic, posts with a lot of likes could subtly change header color similar to the ignore feature, it would make skimming through long threads infinitely more efficient. Hell, it would be nirvana if I could log in and be presented a list of "well-liked" posts since last log in, and not have to wade through a gazillion threads to find the nuggets.