While the U.S. housing market has clearly been on the mend, mortgage application stats and the relative outperformance of companies catering to higher-end buyers, including builders like Toll Brothers, indicate that the benefit is more concentrated than the type of wide-ranging recovery that could help spur the economy and boost the job market.
At this point I think building on the Facebook application environment on Facebook is too volatile, at least for my current uses and prefer the relative stability of tabs.