Alan Gerber writes:

It doesn't absolve you. It increases the odds that you won't enter the
airspace inadvertantly, and there's a chance they'll clear you without you
even asking for it. (And, for class C, you're already talking with them,
so there's no violation.)

While flight following is not an automatic clearance into controlled
airspace, a controller who was providing flight following and failed
to mention a potential unauthorized intrusion into controlled airspace
could be held to not be doing his duty. The pilot would not be
relieved of his responsibility (he's supposed to know for himself that
he is entering Class B), but the controller would seem negligent if he
failed to bring up something this important.

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