Protect personal info from what? That implies privacy.
Protection in no way implies privacy.
FB creates the expectation of privacy by using those terms, and they (or you) don't get out from under that expectation by splitting hairs.
I'd say users aren't totally out of line thinking that an app providing virtual private networking functionality would use a layperson's definition of private (as opposed to a techie's definition involving network protocols).
I'd argue that a VPN app that isn't private should be required to put something like the warning on cigarettes: >
> WARNING: This app monitors and records for all time your every action on your phone and only protects you from 3rd parties who haven't paid us enough money to get access to your data.
With that said, anyone could make the assumption that private means privacy here, and most common use cases for consumer VPNs are for privacy, so, I guess it really matters that they are explicit what they service does, and I think the description above is pretty clear.