Should Scrabble include slang words?

Scrabble has released its updated list of Official Scrabble Words and some of its new words has raised some eyebrows. The list includes words such as Facetime, Pwn, Bezzy, Blech, and Wahh, which are definitely not words you would find in a traditional dictionary. Do you think that Scrabble should include these words that people actively use in their daily conversations? Or should Scrabble follow the language prescribed by grammar books and dictionaries?