Làm seo thì vấn đề mở rộng Reference domain là rất quan trọng, để link mang lại được hiệu quả cao thì Website đó phải chất lượng tốt có thể ko đúng dịch vụ nhưng việc mở rộng hơn bằng những website có chỉ số DA, PA tốt cũng rất cần thiết. Chính vì thếdưới đây là danh sách những website DA> 70 đặt link profile index nhanh hoàn toàn miễn phí cho anh em SEO !

Danh sách backlink DA>70

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http://305020.homepagemodules.de/u52966_Nhsaka.html
https://www.alzforum.org/registration?destination=user/login
http://www.bookcrossing.com/join (DA 76)
https://goo.gl (DA 95)
https://www.google.pl/?gws_rd=ssl#q=http://lichdeban.net
https://jigsy.com/account/signup (DA 70)
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http://www.anandtech.com/Account/Register?r=%2f (DA 83)
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https://del.icio.us (DA 96)
https://www.bloomberg.com/asia ( DA 96)
https://wpengine.com (DA 74)
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Nguồn: vnras.com