Netflix, Salesforce, Tesla, LinkedIn, and potentially Facebook/GroupOn.
Almost every other technology company is trading at lower then average P/E values, including for the first time in a long time, Google and Apple.
So is a handful of potentially over-valued companies reasons to call out a bubble? I'd say no, at any given time there will be absurdly valued companies trading on any given stock exchange, that probably hasn't changed in the entire history of the NYSE.