I like the idea of the lightbulb but the darkness makes be think the light has gone out. :-( I also like the way that the screw base and filament elements of the bulb convey communication but they don't then reach globally.
If it helps, I deal with satellites, planes, cables, desktop pc, tablets, mobile phones and making them all work together for the benefit of a large organisation.
Can you think of any further variations on this theme or otherwise? Regards, Stefan