Search Engine Land, a service with expert information on search engine marketing and optimization, has analysed url shorteners, services to shorten long url’s, regarding the benefits and effects in relationship to search engines and other useful features. The most important factor regarding search engine marketing is the form of redirect, which informs the search engines about a temporary or permanent redirect.
In the following is the comprehensive article with further information and a direct link to the chart:
URL Shorteners: Which Shortening Service Should You Use?
URL Shorteners : The Mega Chart
Directory Sources: URL Shortener, Relocators – Search Engine Marketing
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