Therefore, it's the thousandth number, and is generally used as a view counts landmark.
15,000 kiriban contest! Send me a pic of my pageviews at 15,000 pageviews and I'll send you a prize!!
Now it's being used more for an exclamation of achievement, as hitting the #whatever view of your website is a kiriban.
Baka-chan had a contest for whoever hit the kiriban number and will make a kiriban piece for that person, a gift art.
People came from all over to give kiriban to damphyr for winning the contest.
Kiriban to you for finding my obscure webpage!