His point is that while he's not intentionally on Facebook looking at questionable pictures, it's now on the lock screen of his phone, which he can't avoid if he needs to use it.
Sounds like he isn't a good candidate to use this particular app. Seems pretty clear a younger audience is going to be the core demographic for this product. College aged and younger who spend tons of time on facebook and socializing in general and typically do not have office jobs where "work appropriate" is even a concern.
I'm sure like many things that are touted as essential and central features in the FB world, it will eventually have a switch to disable the feature. It's probably too much to ask for FB to implement a location-based control for its showiness.
