What search engines don't like

-It is extremely important to know what search engines don't want.

-Spam

Search engines hate tactics intended to fool them into awarding high
rankings to irrelevant pages. These tactics are called "spam."

-Some webmasters create spam after they learn which criteria search
engines use to rank pages.

The following techniques are usually considered spam:

• Meta refresh tags
• Invisible text and overuse of tiny text
• Irrelevant keywords in the title and meta tags
• Excessive repetition of keywords
• Overuse of mirror sites
• Submitting too many pages in one day
• Identical or nearly identical pages
• Submitting to an inappropriate category (for directories)
• Link farms


Frames, dynamic content and Flash intros


- Although search engines won't penalize for the use of frames,
dynamic content and multimedia files, they will have difficulty
indexing them.

- Recently, some engines started to index dynamic content.
However, most search engines are still unable to index multimedia and
dynamic pages, and those that are, don't index all of them. Here's a
list of files that search engines don't index:

• Text in graphics (use ALT tags)
• Pages that require registration, cookies or passwords
• XML
• Java applets
• Acrobat files (PDF), except Google
• Dynamic content (URLs with "?" in them), except Google,
AltaVista, FAST and Inktomi
• Multimedia files (Flash, Shockwave, streaming video)