Some examples are the general acquisition of commonsense knowledge (Singh et al., 2002), the use of browser games for that purpose (von Ahn and Dabbish, 2008), and the collaborative annotation of anaphoric reference (Chamberlain et al., 2009).
the use of the Amazon Mechanical Turk, which we use here, has been evaluated and shown to be useful for language processing tasks (Snow et al., 2008).