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Your advertisement is attractive and seems legitimate i will give it a try, hope your prices are affordable and results are effective for long term.
A private blog network (PBN) is a network of websites that place a high quantity of links to another website. These expired domains are purchased and turned into a site that's part of a private blog network, usually having new content added so that its outbound links pass PageRank.
The domain authority of a website describes its relevance for a specific subject area or industry. Domain Authority is a search engine ranking score developed by Moz.