On my particular forum we try and recognise members with more authority on a subject by putting them in groups and giving them a custom flair on the avatar. It doesn’t fix the problem that the most knowledgeable voices often aren’t the loudest on the Internet, but it tries to raise some individuals stature just a little and for everyone to see. Encouraging those users to have a good bio page also helps - at least for members that take the time to look.
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