Calling internet startups a bubble in the same breath as the housing market bubble is doing a disservice to the readers. Every single American was seeing housing prices soar. All sorts of people were borrowing 100k against their new found home equity to "invest" in their home, despite the fact that homes have no revenue, while the majority internet companies do.
Most people running startups in the community I'm most active in (Toronto) have revenue. For example: dateideas.ca is only 6 months old and they have revenue, guestlistapp.com has been out of beta for about half a year (launched a year before that) and they have fairly substantial traction, then you have the bulk-ward of the Toronto tech scene, freshbooks.com, with over 2 million users and a solid business model. Just look at their hiring page, 22 positions listed for a 50 person company.
There is a huge difference between building valuations based on a solid business model and changing public trends (ie, more people getting on/trusting the internet), and building valuations on selling ponzi scheme debt that overvalue non-revenue generating assets like housing. The same article could have been written about clothing manufacturing in England just after the industrial revolution started.