Search Engine Manipulation Articles # 72-SE REVERSE ENGINEERING- Some scientists try to understand the stuff explained in Google patent. I have known people who have read literally all the patents given to Google and its principle engineers. These people try to see which ones are used by the search engines and manipulate their sites or client sites to gain high rankings.
Search Engine Manipulation Articles # 59-NO-SCRIPT AND NO-EMBED TAGS- Search engines are programmed to read the content within the noscript tag. Search engine spammers take advantage of this and will stuff the tag with lots of keywords they want to rank for.
Search Engine Manipulation Articles # 91-TINY TEXT LINKING- Tiny text is the method of hiding text from users by making is as small as possible usually in the range of 1 to 20 pixels.Dot linking is another spam where the person will just use dots to hide links to different pages.
Search Engine Manipulation Articles # 80-SOCIAL NETWORKING SPAM- Social networking sites are increasingly aware of all negative ways and have ton of ways to flag a page or report a spammer. But spammers are increasingly efficient and they find many innovative ways to spam unwary people in social networking circles.
Search Engine Manipulation Articles # 36-HIDDEN LINKS AND TEXT-Hidden text can also be hidden inside alt tags, Noscript tags, No embed tags and no frames tag. Some clever people try to hide text behind images. Users will see only image but the search engines will see the text hidden behind the image.
Search Engine Manipulation Articles # 41-INVISIBLE TABLE CELLS- Similar to hidden div tags you can hide contents and links inside a hidden table tag. You can display the content of the tables to the search engines with stuff keywords and links but the users will not be able to see it.
Search Engine Manipulation Articles # 26-EXPIRED DOMAIN SPAM-Some link spammers will monitor when the domains are expiring and will buy them and replace the old site with their own website.They will retain all the backlinks and reputation this domain already had and all the PageRank will pass to the new website.
Search Engine Manipulation Articles # 47- KEYWORD STUFFING- Keyword stuffing is the method of stuffing junk and obscured words on a web page to inflate search engine rankings. Keyword stuffing can be as low as 20 keywords on different pages or can be as high as 1000s of keywords on a page.