I'm from Brazil, here we have more than 3000 national companies, handling everything from oil, mining and energy to banks and in the past even telecommunications. It was a disaster, you had to wait for about one year to have a land line installed and it costed almost as much as a car, you had to declare it in your taxes!
Social media should be a protocol, in that way it will become naturally decentralized and way harder to censor or control, like email.
This technique of using different filters on top of a monochromatic sensor is also used in astrophotography, it helps with image resolution. You want as much pixels per inch as possible so instead of placing multiple narrow band receptors in your sensor you use a single wide band receptor as your pixel and place a filter in front of the camera, for a RGB camera for example you triple the total number of sensors by doing this.