Update: Here's Mark's first post of this, from 2009
Here's literary critic Edmund Wilson's form-letter for turning down requests from strangers. As Tim Ferriss notes, Wilson wasn't a hermit or antisocial, but he maximized the time he spent socializing with the people he liked by not letting strangers gobble up his time:
Edmund Wilson regrets that it is impossible for him without compensation to:
read manuscripts
< contribute to books or periodicals
do editorial work
judge literary contests
deliver lectures
address meetings
make after-dinner speeches
broadcast;Under any circumstances to:
contribute to or take part in symposiums
take part in chain-poems or other collective compositions
contribute manuscripts for sales
donate copies of his books to libraries
autograph books for strangers
supply personal information about himself
supply photographs of himself
allow his name to be used on letter-heads
receive unknown persons who have no apparent business with him.
The Best Decline Letter of All-Time: Edmund Wilson
(via Making Light)