To reticulate is to form a type of net or network.
Reticulating is an activity that creates a net or network. Linking a group of computers into a shared network reticulates them. A spider spinning a web is doing a form of reticulating. A businessperson making connections with many colleagues is reticulating by creating a social network with them. The key to any form of reticulating is that it makes connections: it links people or things in a type of net.