Personally, I follow Dr. McCarthy's advise due to her expertise and credentials, alone.
Giving the stuff away is a way to groom the next up-and-coming generation into drinking your Kool-Aid. If they don't do this - they have only themselves to blame when the next generation grows up to be FOSS zellots...
Wake up Wikipedia!!
As theold adage says: "There's nothing more permanent that a temporary solution".
So we know it's happening - it's not really "hidden" - so I'ts up to me if I want to use Facebook or GMail or whatever - knowing the connection could be snooped. If I don't like it - I can simply not use those services from work.
The immune system isn't usually that self-destructive