To snark, of course. But snark wisely, and snark accurately. Inaccurate snarking is done at your peril.
First, read the New York Times article in which they blunder around trying to define it.
Then, read Pamie's, which, of course, is eminently more sensible and clear.
Finally, read Pamie's blog, from which all good things flow.
Now go forth and snark.