[ry0ohki]

TV ads, if nothing else, enforce branding in people's minds. Like a funny Miller Lite commercial isn't trying to get an immediate purchase of Miller Lite, but just get the brand to stick in someone's mind the next time they are thinking of buying something. Facebook ads don't offer that same brand awareness (or at least it seems to take a lot more money to achieve the same awareness)

[Splines]

Probably because they're off to the right, easily ignored. If I had ads in my news feed I wouldn't exactly appreciate it, but it'd probably be more effective.

[philwelch]

On Facebook, go "like" a company or a TV show or something. Now you have ads in your news feed.