User Agent Cloaking is similar to IP cloaking, in that the cloaking script compares the User Agent text string which is sent when a page is requested with its list of search engine names (user agent = name) and then serves the appropriate page. The problem with User Agent cloaking is that Agent names can be easily faked. Search Engines can easily formulate a new anti-spam method to beat cloakers, all they need to do is fake their name and pretend they are a normal person using Internet Explorer or Netscape, the cloaking software will take Search Engine spiders to the non – optimized page and hence your search engine rankings will suffer.
To sum up, Search engine cloaking is not as effective as it used to be, this is because the search engines are becoming increasingly aware of the different cloaking techniques being used by webmasters and they are gradually introducing more sophisticated technology to combat them. It may be considered as unethical by Search Engines if not used properly.
Invisible Text – Black SEO
Tiny Text – Black SEO
No Spamming – Black SEO
Besides, instead of spending considerable time and effort on spamming you can always follow other proven strategies and have a higher rank with most search engines. Spamming can also easily irritate readers. Think about it — if your homepage has unnecessary repetitions of a particular keyword, it is bound to frustrate a reader. Consequently, your site, instead of being content-rich, would be junk rich. This can have nothing but a negative impact on your business.