I sing in a choir <a href=" http://catraffictickets.com/index.php/persuasive-essay-drinking-and-driving.html ">compare and contrast research paper</a> Another slide illustrates how an analyst can use the program to search “within bodies of e-mail, WebPages and documents.” Analysts using XKeyscore can also use a NSA tool called DNI Presenter "to read the content of Facebook chats or private messages,” according to the Guardian article.