Crossword puzzle clue "buddy who everybody knows is gay but himself"

Buddy who everybody knows is gay but himself?

Place where everybody knows everybody

Who wrote "He who knows others is wise; he who knows himself is enlightened"

"___ should keep himself to himself": "Treasure Island"

"Man will do many things to get himself loved, he will do all things to get himself ___": Mark Twain

Everybody-plays-everybody tournament?

"Everybody Loves Raymond" or "Everybody Hates Chris"

"The wise man knows himself to __ fool": Shak.