In March, the average Facebook mobile user engaged with the social network for more than 7 hours, according to . That's a lot of head-down time to which Facebook has to respond.

Facebook chief Mark Zuckerberg, who was on the road last week talking with investors about the company's growth strategy, said his top priorities this year are to transform Facebook's mobile and advertising experiences and further integrate online apps into the platform, reports .

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With more people than ever using smartphones and accessing sites like Facebook on them, the is how the company can make more money with advertising on mobile. You can bet Facebook will figure it out considering advertising is the reason Zuckerberg and other insiders are about to become extremely rich.

For users, more advertising on mobile is somewhat of a drag, but there's utility involved as well. A lot of what we're doing on and with our mobile devices is being tracked by scads of application developers and device makers who aim to improve their products and marketing activities because they know what we like, where we go and how we spend our money.