Kiribans are awards that pageview whores give out, hopefully to encourage people to check by regularly in hope they get the award, which in turn, raises their pageviews faster...but I bet the OP found that out already
Etymology Japanese キリ番 (kiriban) from 切りのいい番 (kiri no ii ban) - "a number which is a good place to stop", "a round number".
kiriban (plural: kiriban or kiribans)
1. A milestone; an interesting number displayed on a web counter, such as 10000, 22222, etc.; particularly, one selected by the website owner for the purpose of giving a prize to whoever reaches it. 2. A gift or prize given to one who reaches such a milestone. 3. The system of giving gifts to those who reach web count milestones.
Also used as in attribution, as kiriban winner, kiriban number, kiriban picture, etc., or with a number indicating the kiriban, as kiriban 5000. Can also be said as kiribian.
Well, I had wondered what the actual meaning of it was, found this, read the first comment and did it, when I came back I figured what I had found explained it way better, so I decided to post the info I found in case someone else wants to know. Is that bad?