Facebook, the biggest social networking site on the planet, will debut the Want button this week at its f8 Developers Conference, according to Internet Retailer.

The site states the button will enable users to share with their network the specific items on Facebook they would want. It is part of a series of new buttons the social network plans to launch that will allow consumers to indicate that they’ve read, listened or watched particular features on Facebook.  

“The new buttons will likely enable Facebook to gather more information about consumers’ behavior,” reports Internet Retailer. “The more information Facebook gathers, the more marketers can target ads at specific consumers.”

Global revenues at Facebook will top $4.27 billion in 201 – a $2 billion increase since 2010, according to a new eMarketer report. The organization predicts Facebook will reap $3.8 billion worldwide this year in advertising revenue, up 104% from $1.86 billion in 2010. Revenues from Facebook Credits, eMarketer estimates, will come to $470 million in 2011.

Facebook now has more than 800 million users, having added 50 million since July. Click here to read more details on the changes coming to Facebook in addition to the Want button.