Ask HN: are mobile apps the Next Big Thing for business SaaS?

When Facebook publicized their IPO one of the main risk factors [1] they had to declare was the difficulty of monetizing mobile.

A year later Facebook Mobile makes up 41% of their revenue [2]. Is Facebook an outlier or have other companies seen similar improvements? What about B2B SaaS companies - should they invest heavily into mobile?

Jason Lemkin thinks mobile is the next big thing for business SaaS [3]. What do you think?

[1] http://www.sec.gov/Archives/edgar/data/1326801/000119312512034517/d287954ds1.htm#toc287954_2 [2] http://bits.blogs.nytimes.com/2013/07/25/daily-report-facebooks-mobile-ad-revenue-cheers-investors [3] http://www.quora.com/Software-as-a-Service-SaaS/What-is-the-next-big-thing-in-terms-of-SaaS-dedicated-for-businesses/answer/Jason-M.-Lemkin