Because their diet is primarily insects, these spiders play the important role of controlling the growth of insect populations.
They vibrate so rapidly and look so silly, I named them clown spiders. I wonder if anyone here has seen the French animations called, Minuscule. They have a spider just like these, but they have him as an orb weaver, and you should see his face. These computer animations are done on real background and are amazing. They are available on Youtube.