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With respect to all the senior members, I am a newbie & I make 50 backlinks for my site every day, (using forum, social bookmarking and Blog commenting) recently my experienced cousin said that Google doesn't value these type of link anymore like they once used to. They love backlinks which are valuable and natural & suggested me to build natural link via Guest Blogging and Broken link building methods, because instead of making those forum & other links(50), I should make 5 natural links a day which will help me rank better.
My question is, is it true? are natural links really powerful than the other ones?