Facebook is busy hiring in the US and around the world , notably pulling in engineering and product leaders from Google and other companies around Silicon Valley. But a few well-known employees, especially early ones who have vested, are no longer with the company . Here’s a closer look at the recent departures: Aaron Sittig — Few employees have had a bigger impact on Facebook’s look and feel over the years.

It’s not often that we fight. Actually, no, that’s not even slightly true. It’s not often that we fight on camera .

Facebook’s service is designed to be simple and intuitive enough for everyone to use. However, some power users want more flexibility to customize their experience in ways that might be too complex for the general public

Zivity is a great site for women and photographers who aren’t afraid to get a little racy to express themselves and potentially be discovered. That said, they obviously don’t have the reach of something like Playboy . But thanks to a new partnership between the two, interested women can potentially get the best of both worlds

Back in February 2009, we wrote about the relaunch of Virb , a social network owned by MediaTemple’s venture platform (mt) Ventures.

Health education websites such as WebMD have been around for some time now, but recently launched startup ChickRx has a slightly different take on the online medical information space. ChickRx is a health website and community for twenty-something women

Social networks worldwide are estimated to bring in $3.3 billion in advertising dollars this year, according to updated estimates by eMarketer . That number represents a 31 percent increase from 2009′s $2.5 billion.

Officially launching today is Mappiness, a UK iPhone app that “maps Happiness” by pinging users with a survey in order to plot out their feelings during the day (happiness, in this case, is apparently user-defined). Using LBS, the app links responses and response locations to environmental data in an attempt to, according to lead researcher George MacKerron, “better find answers on the impacts of natural beauty and environmental problems on individual and national well being.” MacKerron, based at the London School Economics, elaborated on the idea of tracking happiness, “In the 19th century economists imagined a ‘hedonometer,’ a perfect happiness gauge, and psychologists have more recently run small scale ‘experience sampling’ studies to see how mood varies with activity, time of day and so on.” Mappiness is the first project of its kind to add location to the mix

Say you’re looking for a picture of a cute demon or a violent little girl? And you want to talk to other people about those selfsame pictures? Where, besides the Heavy Metal Con circa 1988, can you go?

Hulu is testing the waters for an IPO , hoping to get a valuation of $2 billion, according to the New York Times. A Hulu IPO would be a pure play on the transition of TV to the Web. While the company has not yet filed with the SEC, in the past it claimed to have 2009 revenues of $100 million , and is perhaps on track to double that this year