【文件属性】：
文件名称：Avoiding Spam
文件大小：349KB
文件格式：PPTX
更新时间：2011-10-22 08:22:32
spam
From its modest beginings as a means to share Physics data, the
web has grown to be a central part of cultural, educational and,
most importantly, commercial life. Millions of users today are performing
financial transactions on web pages, varying from buying
goods, to booking travel and hotels, to applying for credit cards or
mortgages. Due to the astonishing amount of information available
on the web, users typically locate useful web pages by querying a
search engine. Given a query, a search engine identifies the relevant
pages on the web and presents the users with the links to such
pages, typically in batches of 10–20 links. Once the users see relevant
links, they may click on one or more links in order to visit the
pages.