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购买反向链接风险极大。谷歌强烈反对这样做，你的网站可能会因此受到惩罚。Tumblr is a microblogging site that’s been used to be one of the best websites for free backlinks because it could pass a lot of link equity to a target site. Back in the day, some people could rank micro niche sites just by using Tumblr backl