It already makes me feel a bit old to remember the days when Gilt, Fab, LivingSocial, and Groupon were all riding hot as variants of discount deals and but one by one have fallen from grace.
Back in the 1990s, people seemed to constantly talk about "Internet time." Referring to the sense that a year online, seemed like forever - especially given most people had spent very little time online, the Web was expanding at a rate essentially never seen before, there was little to compare it to historically, it all seemed to change a lot in one year. It still sometimes feels like the Internet time effect, when you refer to the brief era of Groupon's boom - it seems like it was a decade or more ago, when it was just three to four years.