Deep understanding of Web 2.0 and API's

[1] What is web-2.0? Web 2.0 is a new generation of W.W.W, which is aimed more at the ability of people to collaborate and share information online. Web 2.0 refers to the transition from static HTML Web pages to a more dynamic Web, which is more organized and is based on serving Web applications to its users. Changes we saw in web 2.0 from web 1.0: - Web 1.0 Web 2.0  DoubleClick --> Google AdSense  Ofoto --> Flickr  Akamai --> BitTorrent  mp3.com --> Napster   Britannica Online --> Wikipedia  personal websites --> blogging         evite --> upcoming.org and EVDB  domain name speculation --> search engine optimization  page views --> cost per click  screen scraping --> web services  publishing --> participation  content management systems --> wikis  directories (taxonomy) --> tagging ("folksonomy"...