If you buy expired domains to use it for an own blog network or if you are buying links from blog networks with PR this is something to mention: By mixing the contents topics, you will burn the trust, authority & the power of existing linkjuice, because the expired domains looses its topic, which it has been related to This is why the links from such networks work for a short time and loose their power soon. Most buyers of expired domains are uploading wordpress and are pushing content into it, which has no relation to the content which has been found there before. Even bader that the topics are now loans, get your ex back and dog training stuff totally mixed up. But how can we keep the power of expired domains? Keep the topic relations which the domain was known for. Do some recherche with cache-data, if possible, keep the main title - tag. Keep the server location, and don't change the country Buy whois privacy for the domain, immedieatly with your purchase "Redesign" the page and don't throw a standard theme on it. If you think a bit, it literally makes no sense in the eyes of google if the domain changes its topic from strictly related today and totally mixed up content the other day. Of course it does not deserve to keep any of its previous linkjuice. Think about it. Harder work, but much better results.