To save time, they've always been shot with studio cameras, on video. Where soap operas come in is their speed of production. (I say cheap because the same frame interpolation was already available as a transition on the first generation of DV camcorders back when I was in college.)
To show off this feature, some idiot one realized that, by adding a cheap frame interpolation chip, any source-including movies shot at 24 fps-could be nudged up to 60 Hz. Modern HD tvs can display full frames of video at 60 Hz. It's a subtle effect, but it's one that our brains can sort-of detect: The motion in a native video image is "sharper" than film. This means that effectively tv was playing back motion at ~60Hz, rather than flashing the same frame 3 times. Video cameras would record (and tvs would play back) every other line of an image, alternating between even and odd at (in North America) 59.94 Hz. When video came along, it used a different method of cheating. Standard motion picture film, though only shot at 24 frames per second, sits behind a spinning shutter that looks something like a radiation symbol: As it spins, it flashes each frame three times: 3*24=72 Hz. (In 35mm, that's almost 1.5 meters of film going through the camera every second!) It was realized that you could cheat by flashing the same frame multiple times. The chemicals available in the early days of motion picture film simply weren't fast enough to get a good exposure at that speed-and it would have taken a LOT of film. To fool the human brain into believing that a series of flashes are a continuous, moving image, the flashes have to come at a minimum of between 50-60 Hz (cycles per second). It's the tvs that are applying an effect. No effect is being applied to soap operas.
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