[jhgg]

I'm a bit confused by this article, the author mentions:

    While the official standard way to to fix this problem is described in the offical Android Blog.
    Seems like Facebook missed it. What a waste.

However, in the post linked by facebook, they explain why they couldn't use it (vaguely)

    After a bit of panic, we realized that we could work around this problem by breaking our app into multiple dex files, using the technique described here (http://android-developers.blogspot.com/2011/07/custom-class-loading-in-dalvik.html), which focuses on using secondary dex files for extension modules, not core parts of the app.

[redDragon]

Yes i sort of forgot about it, the facebook article was old, i read it a long time ago, i rediscovered the issue when running FB on one of the Gingerbread devices.