The prefrontal cortex is the most peculiarly enlarged part of the brain in human beings, but whereas the part near the top of the head generally seems to be involved in conventional intelligence, the "orbital" region tends to handle the processing of social information that is, assessing the moods and personalities of other people.

WSJ: The Social Network and the Dunbar Number | Mind & Matter

Some of them don't have to file tax returns and the Social Security Administration doesn't finish processing its 2007 earnings information until June.

FORBES: A Little Too Little

For those not used to seeing social updates as a steady flow of information rather than individual nuggets needing processing, it can be overwhelming to see all the little bits.

FORBES: The Unfortunate Culture of Awesome