Net-tweerk: Is a slang term. To define Networking, with a twist.
Net-Tweerk / Net-Tweerking: is two or more (internet accessible) web/data-servers (clusters) that work together to supply a domain or internet service. The twist is that all servers are located in different geographical locations, and connect to the internet through standard ISP connections.
As opposed to a "Network" of servers to which all are located in the same data-centre.
More on this eventually...