A Snapshot of Facebook's Mobile Clients on the Eve of the Verizon iPhone

With the Verizon iPhone arriving in stores tomorrow, let’s take a quick snapshot of where iOS, WebOS, Android and other mobile platforms stand as measured by monthly active users of Facebook smartphone apps. Like we said last week, this isn’t a perfectly accurate measure for overall market share. But it may be relevant to developers who want to know how many  smartphone owners are willing to download and engage with apps on each platform.

Customers who pre-ordered the Verizon iPhone have started getting their devices in the mail, so we have seen an uptick in new Facebook for iPhone usage.