As VentureBeat notes:
The “for free” part isn’t so much a dig at Twitter, which also lets you message for free, but a dig at simple text messaging services (also known as SMS), that cost money to use.
Via VentureBeat
(Credit: Facebook on the iPhone)
Will the new Facebook
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Twitter is interesting and sorta fun but it’s annoying that I can’t interact with it the way I want to–at least not consistently. Any limitation or change that forces people to change their behavior is a negative. SMS is bit annoying too in that you can’t mass communicate, at least not for free.
If Facebook offers a “communication utility” consistently, as part of their platform, it has way more users than Twitter and should be able to push it aside pretty quickly.