The network is said to consist of powerful PCs with extra-strong WiFi antennas that communicate with each other and act as portals for smaller networks of perhaps a dozen nearby PCs.
The most popular portal in SNet reportedly has more than 7,000 registered users.
It's said to cost about US$200 to equip a group of computers with the antennas and cables necessary to become a node.
Technically, SNet is illegal, because WiFi equipment use requires a Ministry of Communications license, but the authorities apparently turn a blind eye so long as SNet doesn't breach Cuban laws. Volunteer administrators ensure that users don't share pornography, discuss politics, or link up to the World Wide Web through illicit connections.
The self-policing "may be the reason authorities are turning a blind eye," King suggested. "There's wisdom in turning a blind eye to minor infractions so you have the energy to address major crimes."
Although SNet users carefully skirt politics, some daring Cubans with access to the Internet have created a vibrant blogosphere that questions national policies and on occasion has pressured the government to act on issues of public interest.