Gnomic analysis
1. Provide storage and compute power closer to the edge of the mobile network.
2. ???
3. Profit!!!
The thing about Facebook is that it is a service that billions* of people want to use. There's no way that it's going to migrate its storage and smarts out of its own data centers to kit controlled by carriers who, given the chance, are every bit as rapacious at it is.
The missing step is to replace those question marks with some killer app to supplant FB and capture those billions of users — and of dollars. The carriers' record of being able only to encumber phones with unwanted crapware does not inspire confidence.
* Well, according to FB's reach figures [Reuters], at least.