Ive heard that some of the search engines filter links that are generated by link exchange and link exchange software. Is that true?
Although it is impossible to know exactly what weighting and filtering systems each search engine uses, it appears that some search engines do tend to remove links that appear too similar. BigLinx uses a proprietary, patent-pending method for generating unique link pages for every member, so when search engines crawl a BigLinx-generated link page, your link won’t be filtered out.