Run for the hills when it comes to advising clients to invest in the Internet.

That's the advice of the Wall Street journal's James Altucher who writes that

The days of infinite margins, 1,000% productivity gains, and growth of market throughout the universe are long over. Internet companies now should be treated, at best, like utility companies that get bought at about 10 times earnings and sold at 13 times earnings.

and adds that

Even then, I'm not sure I would give the Internet sector the same respect as the monopoly-protected utility sector.