Facebook: A rush for the mobile messaging market

Since Facebook started letting users comment on friends status updates on its mobile site yesterday, it says more than one million users have made these Twitter-like replies in the last 24 hours.

In the minds of Twitter users, this commenting feature likely seems most analogous to the “@friend” feature of Twitter, where you can designate a message to one friend and have all of your friends see it. Certainly, Facebook’s commenting-on-statuses feature encourages the same sort of group commenting.

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But to most of Facebook’s users around the world, this new reply feature is also a way to save them money on sending group text messages. Instead of paying a carrier to send texts back and forth, they can just log on to the Facebook mobile site and do it for free. It looks to me like another nail in mobile text messaging’s coffin.

Of course, this is also yet another indication that Facebook is going to keep competing, obliquely, against Twitter, instead of doing something silly like buying it.

Big picture, Facebook has seen its mobile traffic surge from five million monthly active users worldwide at the beginning of the year to 15 million monthly active users now. The site has meanwhile quickly grown to 120 million monthly active users worldwide, across web and mobile — those are internal stats, third-party stats are much higher. It’s now the largest social network in the world, with growth coming primarily from outside the U.S.