Web Applications: Internet Search and Digital Preservation
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1 CS 312 Internet Concepts Web Applications: Internet Search and Digital Preservation Dr. Michele Weigle Department of Computer Science Old Dominion University 1 Outline!!Generic Searching!!How Google Works!!Digital Preservation»! Internet Archive»! Memento»! Archive Facebook 2
2 Generic Search Engines!!Some very popular ones»! Google»! Bing»! Yahoo!!!Some common characteristics»! Huge set of results»! Extremely prompt retrieval»! Organized retrieval results How do they achieve such amazing results? 3 How Do Search Engines Work?!!Prep work»! crawling an automated way of browsing the web for pages»! archiving, analyzing, organizing, indexing!!retrieval»! query matching»! ranking search results»! displaying search results 4
3 Search Query Syntax!!The space between keywords is interpreted as AND for some search engines, but as OR for others.!!query: I'm interested in cancer in adults.»! Boolean logic: AND»! Search query: +cancer +adults!!query: I'm interested in radiation, but not nuclear.»! Boolean logic: NOT»! Search query: radiation -nuclear 5 Outline!!Generic Searching!!How Google Works!!Digital Preservation»! Internet Archive»! Memento»! Archive Facebook 6
4 Google!s Three Main Components!!Crawling!!Indexing!!Page Weighting 7 Google!s Crawler, the Googlebot!!Consists of many computers requesting and fetching pages»! Googlebot can request thousands of different pages simultaneously!!when Googlebot fetches a page, it adds all of the links in the page to a queue for subsequent crawling (deep crawling)»! Googlebot can quickly build a list of links that can cover broad reaches of the web!!google continuously recrawls popular frequently changing web pages at a rate roughly proportional to how often the pages change (fresh crawls) 8
5 Submitting URLs to Googlebot!! URLs that Google suspects are trying to deceive users»! including hidden text or links on a page»! stuffing a page with irrelevant words»! cloaking (aka bait and switch)»! using sneaky redirects»! creating doorways, domains, or sub-domains with substantially similar content»! sending automated queries to Google»! linking to bad neighbors. 9 Google's Indexer!! Parses webpages discovered by the Googlebot!! Converts them into a set of hits (word occurrences).»! For each document in which the word appears, indexer stores the position of the word, font size, capitalization!! Creates an inverted index that is indexed by word pointing to documents 10
6 Google's Page Weighter, PageRank!!Assigns each webpage a relevancy score!!a webpage's PageRank depends upon»! frequency and location of keywords within the page»! how long the webpage has existed»! number of other webpages that link to the page!!most important factor is number of pages that link to the page»! essentially, PageRank is a vote, by all the other pages on the Web, about how important a page is 11 PageRank Example PageRank: Number and importance of links pointing to you! Time 6:20-8:30! 12
7 Manipulating PageRank / Webspam!!Google bomb»! is created if many sites link to the page using the same anchor text (increases the page rank)»! ex: In 1999, a search for more evil than Satan himself resulted in the Microsoft homepage!!spamdexing»! deliberately modifying HTML pages to increase the chance of their being placed close to the beginning of search engine results 13 Manipulating PageRank / Webspam!!link doping»! embedding a large number of gratuitous hyperlinks on a website, in exchange for reciprocal links!!google Jacking (page hijacking)»! creating a rogue copy of a popular website which shows contents similar to the original to a web crawler, but redirects web surfers to unrelated or malicious websites. 14
8 How to Improve Your PageRank!!Search Engine Optimization (SEO)!!Straight from Google»! keyword tool (time 17:04-18:18) "! be relevant, but don t overdo it! (time 23:11-25:24) 15 Outline!!Generic Searching!!How Google Works!!Digital Preservation»! Internet Archive»! Memento»! Archive Facebook 16
9 Digital Preservation!!Much of the record of our lives is digital.»! How do we keep these records?»! How do we walk down memory lane?!!backup strategies!!recording and archiving the web!!accessing past versions of webpages Web Science and Digital Libraries Research Group at ODU ( 17 Internet Archive!!Internet Archive»! non-profit that was founded to build an Internet library, with the purpose of offering permanent access for researchers, historians, and scholars to historical collections that exist in digital format»! Archive!s Wayback Machine»! allows you to browse through 85 billion web pages archived from 1996 to a few months ago»! 18
10 Memento!!Time Travel for the Web»! Firefox add-on»! / Demo!!Uses Internet Archive and others to present a webpage as it existed at a certain date/time Web Science and Digital Libraries Research Group at ODU ( 19 Archive Facebook!!Grab a stand-alone archive of your Facebook account!!archive everything you want instead of what Facebook wants!!preserves FB look-and-feel!! 20
11 Archive Facebook Content Dump versus WYSIWYG 21 Outline!!Generic Searching!!How Google Works!!Digital Preservation»! Internet Archive»! Memento»! Archive Facebook 22
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