About: http://webisa.webdatacommons.org/212254897

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	By generating a word that is distorted or is placed over a mottled background, free email providers such as Yahoo! have prevented Web bots from creating email accounts from which they send spam messages.
http://www.w3.org/ns/prov#wasQuotedFrom	acm.org