Whatever else Facebook has planned for its mobile presence, it is continuing to define how social networking is done across native applications on operating systems and on the mobile web. The company occasionally releases milestone numbers for overall mobile usage, and as you can see below compared against the total announced traffic numbers, mobile has quickly become a key part of what Facebook users do.

The most recent data that Facebook has publicly announced shows it having 500 million monthly active users as of July 2010, and 250 million on mobile in late March of this year. As you can see, mobile is now more than a third of all Facebook usage going by any numbers. (Note: We approximate the overall traffic number on the date of the last mobile announcement using data from our Inside Facebook Gold report. You’ll get an even steeper total if you use comScore’s data for the same period.)

Out of this growing mobile usage, Facebook is strong across native mobile apps and its mobile web site (along with any other services counted in the mobile total, such as custom SMS plans in some countries). We don’t have a precise way of breaking out the numbers from there, except that Facebook does publish monthly active and daily active users for native mobile clients.

Looking at these, you can get a more specific idea of its success.

As has been the case for years, its Facebook for iPhone app is in the lead, growing quickly and steadily to nearly 80 million MAU today. Even more striking is the fastet growing DAU count, at around 45 million. Its sticky  ratio, already above 50%, is continuing to go up. When the company launches its iPad app, it could see even more users and engagement.

> Continue reading on Inside Facebook.