I really like public endorsements in forums, when the comment/post shows the names of ppl who like it, it lets me know if I can trust an opinion, especially if I've seen those names before, which is common here.

Instead of ppl commenting seconded or I agree, they could endorse a post to publically show their name next to a like/upvote. The inverse would also be nice as well, downvote/disagree and show your username, both would be helpful information, becoming more valuable overtime.

As an addition to upvoting/downvoting, not replacing it.