Removed From Google Index Why? - Don't participate in...
(Page 2 of 9 )
"Don't participate in link schemes designed to increase your site's ranking or PageRank. In particular, avoid links to web spammers or "bad neighborhoods" on the web as your own ranking may be affected adversely by those links."
"Google may respond negatively to other misleading practices not listed here, (e.g. tricking users by registering misspellings of well-known web sites). It's not safe to assume that just because a specific deceptive technique isn't included on this page, Google approves of it."
Webmaster Guidelines | Quality
Yahoo Search is even more restrictive in their definitions of spam and undesirables, however, concentration on detection and removal has not been receiving quite as much focus. It would be an excellent idea to be aware of and conform to Y's restrictions, since Yahoo has no reacceptance policy. Banishment has been, in every case I've heard of, permanent. [http://help.yahoo.com/help/us/ysearch/deletions/deletions-05.html]
4. Crosslinking / Interlinking
The latest practice apparently added to the list of undesirables is crosslinking or interlinking. Made for the SE sites are linked together in an attempt to artificially inflate PageRank.
"Cross-linking - If your entire site is sitting at PR0, one possibility is a cross-linking penalty. Sometimes a webmaster who controls two or more websites will place links from every page of one website to every page of the other sites to increase the PageRank of all the sites. If detected, this will quickly incur a penalty if not an outright ban from the Google index."
More Search Engine Tricks Articles
More By Jase Dow