I have come to see FB as a public health menace. We need to approach it with the means of epidemic containment. We won't be able to inoculate people against it; we need to begin with actively discouraging people we know from using it.
As for "value" from spending inordinate hours on this brain killer, one very good friend found himself with 2.5 million (as in six zeros) Likes in a mysterious and unexplained way--especially because his page promoted the fine arts, not exactly stuff for headlong liking by the masses.
He persisted with this hydrocephalus monster for more than a year out of curiosity to see if this deluge of Likes would bring more traffic for his small online business. The result was exactly what you have already guessed: ZERO!!
Three months ago, he finally deleted the account because he found this whole thing "grotesque and insane." Meantime, he had strange offers by people to BUY the profile. We never understood how he ended up with 2.5 million Likes as a matter of curiosity. But, the bottom line was total absence of value added.... (his new profile has so far garnered 560 Likes; sounds 'normal').