Reddit badges, btw, are a great example of native advertising. In addition to advertisers badging their native ads, I would guess that most badges on reddit are fake, either automatically awarded by the software to popular posts or given out arbitrarily by reddit staff, with the intent of giving users the impression that it's common for redditors to spend real money to "gild" or otherwise flair posts that they like, so that they might do the same (despite the fact that none of the money goes to the person who authored the post they like).

For those doubting this, remember that Reddit was bootstrapped by Spez and Alexis (by their own admission) posting stories through many sockpuppet accounts to make the early community seem larger and faster-growing than it really was.

EDIT: https://arstechnica.com/information-technology/2012/06/reddi...