New Delhi, March 7 -- Over the past few weeks, my Instagram feed has become a time machine. Millennial friends have been posting grainy photographs (with the help of an Instagram filter) of attending the Michael Learns to Rock concert with captions reminiscing about listening to the band on their Discmans and iPods. Content creators are discussing the beauty of terrazzo flooring and the emergence of "lived in" fashion (including Chanel's new flap bags that look used). None of the videos feel over-lit or heavily edited. The tone is conversational, almost offhand. Never before have I seen so many unorganised dressing tables and messy office desks on my timeline. Or unplated meals, or half-closed eyes in group photographs.

Individually, the...