About .edu backlinks:
In regards to back links, .edu links are the strongest. In many cases, .edu back links can lift a #30 ranking position to a #10 position or higher. Additionally, a smaller number of .edu back links are needed to lift a #4-#5 ranking to a #1-#3 spot than other links. Please note that reports are not available for .edu back links, unless you purchase a package of 300 or more.