According to The Washington Post and the Pew Internet & American Life Project, many of the site's users don't like it when others "overshare" information. In other words, there are Facebook users who don't necessarily want to know what you ate for lunch.
The Post wrote, "... nearly a quarter of users strongly dislike the 'temptation of pressure to share too much info' about themselves. So not only are some Facebook users unhappy with the information overload -- a significant proportion don't like how the service makes them feel obligated to engage in the same sort of oversharing."
-- Phillip Tutor