@kim
Social networking platforms. There are a handful that have billions or hundreds of millions of users. It's not possible for most to connect with other users across network boundaries.
https://en.wikipedia.org/wiki/List_of_social_platforms_with_at_least_100_million_active_users
Decentralisation means letting other entities, like individuals, families, enterprises, governments, universities, and civil society organisations, set up or manage their own social platforms and still stay connected to other people.