<http://schema.org/description>
"Twitter announced that it is updating its List feature, expanding it so that users can now have up to 1,000 lists with a maximum of 5,000 accounts in each one.\r\nUpdate to Twitter lists: ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/twitter/2013/05/30/twitter-expands-lists-allowing-users-up-to-1000-lists-of-5000-accounts-per-set/>