Online Celebrities in Ad Campaigns

I kept wondering whether those online celebrities with insane (but short-lived) popularity were ever contacted for commercial endorsements. Turns out, Gary "Numa-Numa" Brolsma is promoting an indie band and sells ringtones, World of Warcraft's Leeroy Jenkins will appear on a trading card, Mahir "I Kiss You" Cagri was paid by etour.com to appear in promo events, and now LonelyGirl15 was contracted by Y&R to do a PSA (see on YouTube) for the United Nations. There are still plenty more left.