I disagree... Facebook is full of people I know.. so in between bits of actually useful stuff about family members, and seeing what friends are doing, I get mad stuff from people I know who are convinced that "eating a lemon a day will keep your blood ph neutral", "pigs are so toxic its impossible to poison them", inane quotes with a picture of a minion next to them, and a large pile of racism from various xenophobic groups
On the other hand, my twitter feed is full of the people I wish I actually knew in real life, writers, journalists, comedians, scientists, musicians etc, who post interesting and funny posts, where I turn to when Facebook makes we want to weep.