This tutorial is awesome - how to create constantly moving networks of nodes and connecting lines, which is such a cool effect. The line is created using a Beam effect, as this object has a start and an end point which can be defined as the position of two nodes ie. the beam ends will move in relation to the movements of the connected nodes. The node movement is supplied via the wiggle expression setting, creating a randomness of movement within defined parameters (the number of moves per second(?) and the furthest movement allowed).
The video described how to perform this manually (good for understanding what is going on), and then gives information about a script that can automate the process - particularly useful if the number of nodes required increases significantly!!