Skype

Skype’s origins run through a Swedish telecom portal project. Niklas Zennström and Janus Friis worked at Tele2, which wanted to build Everyday but lacked strong web developers. A team in Estonia learned PHP quickly, built the portal and later joined Zennström and Friis to create Kazaa, a peer-to-peer file-sharing product. Kazaa became one of the internet’s most popular applications, but the founders faced significant legal pressure and sold the company on paper while retaining the underlying technology. The same people and technical assets then became the starting point for Skype.

The interview leaves the legal sale of Kazaa vague: the hosts say they could not find a price or a complete account of the Australian buyers. What is clear in their story is that the founders preserved the technology and looked for another use. This was not simply a clean-sheet start; Skype inherited a team with experience building large peer-to-peer networks and a technical base developed for file sharing.

Kazaa’s peer-to-peer design distributed file downloads across users’ computers instead of requiring everyone to retrieve a complete file from one server. Popular files could download quickly because many peers supplied different pieces at once. The approach reduced the burden on a central server, which mattered before cloud hosting and content-delivery networks were as developed as they later became. The tradeoff was reliability: a distributed network could be less predictable, but it could also support large usage without the same centralized infrastructure costs.