I recently received a note from TripAdvisor, saying that I had been designated as a Senior Reviewer. It made me feel like one of those correspondents on the Daily Show, which only employs senior correspondents.
Seriously, I thought the TripAdvisor approach was a rather clever way of acknowledging volunteer contributors to the website.
And the criteria for promotion are clear:
1-5 Reviews: Reviewer
6-10 Reviews: Senior Reviewer
11-20 Reviews: Contributor
21-49 Reviews: Senior Contributor
50+ Reviews: Top Reviewer
Of course, the quality of reviews is inconsequential to this scheme.
But it's a great way of recognizing voluntary contributors to the site and encouraging them to contribute more. I'm already working on my promotion to "Contributor."