SEO in the World of Web 2.0

AJAX poses similar problems to spiders as Flash does. That’s because AJAX also relies on JavaScript — that’s what the “J” in AJAX stands for, after all. Search engine spiders can’t execute JavaScript commands (or Java either, for that matter). AJAX can be used to pull data seamlessly in the background onto an already loaded Web page, sparing the user from the “click-and-wait” frustrations associated with more conventional Web sites. It’s a great timesaver for users, but the additional content that’s pulled in via AJAX is invisible to the spiders unless it’s preloaded into the page’s HTML and simply hidden from the user via CSS.