Hubz are general-purpose websites built with Hubzilla. Every website member can create their own unique website or social space, and these can all share and interact.
Hubz all over the internet connect together "magically" to create very large communities and social networks; and these can all share and interact.
Hubz members can easily and securely share stuff with members of other Hubz. Publicly or privately. Anything, anybody.
Hubzilla is open source and built using common webserver technology (PHP/MySQL/Apache, althogh Mariadb or Postgres and Nginx could also be used, we're pretty easy).
Hubz are
decentralised
inherently social
optionally inter-networked with other Hubz
privacy-enabled (privacy exclusions work across the entire internet to any registered identity on any compatible Hubz)
Possible website applications include
decentralised social networking nodes
personal cloud storage
file dropboxes
managing organisational communications and activities
collaboration and community decision-making
small business websites
public and private media/file libraries
blogs
event promotion
feed aggregation and republishing
forums
dating websites
pretty much anything you can do on a traditional blog or community website, but that you could do better if you could easily connect it with other websites or privately share things across website boundaries.