Please tell me someone has pictures of Seesmic founder Loïc Le Meur giving small-time technology investor Michael Arrington Segway riding lessons outside 330 Ritch for the TechCrunch50 conference's closing party. For now, I'll have to settle for Siqi Chen, left, and Alex Le, right, the guys behind Facebook widget Friends For Sale, at the Plista party at Fluid. Where's the afterparty? It's not at the W or the Four Seasons. Maybe Mahalo chief Jason Calacanis is drinking responsibly tonight and has turned in early, but I'm pretty sure Arrington is up drinking scotch somewhere.

Serious Business founders Siqi Chen and Alex Le created the Facebook application Friends For Sale, which has over 550,000 daily active users. On Friday, the pair announced they'd landed $4 million in a first round of funding from Lightspeed Venture Partners. The investment gave the company a "healthy double-digit" valuation, according to Inside Facebook's Justin Smith. (For Chen and Le's sake, we hope there are another six digits after those two.) "We're already profitable, and the investment is going to help us get a head start," Le told Smith. Impressive, if true. Smith recently compiled a list of the CPMs, or cost to display an ad 1,000 times, Facebook developers earn on their applications. The average came in at $0.92. One app earns as much as $4.78 per thousand views and another just $.04.