Mary Meeker from Kleiner Perkins is the undisputed leader in using big data to describe and analyze the major trends in the tech industry. She and KPCB have published a renowned annual research report since 2001. Take a look at her analysis from 2002 and her 2018 report. The differences and trends are fascinating.
2002 Report: https://www.slideshare.net/kleinerperkins/the-internet-a-perspective-june-2002
2018 Report: https://www.kleinerperkins.com/perspectives/internet-trends-report-2018