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Hi, I found a great website and tought its content would be extremely interesting for our clients. I wrote about it on my blog (which has an URL with our website URL in it) , Facebook Page and even  in Twitter. Meanwhile, I contacted them and offered to write an article about an interesting subject for them. They accepted and liked it so much that they decided to put 2 links for us on two of their pages. My questions are : Will this be a reciprocal link for Google?  Did I make a  mistake talking about them on my blog ? Did I «devaluate» the links they gave us?

We rent apartments. One way we use to find clients is to advertize these apartments in Classifieds. Generally, we use free ads. Sometimes, for very popular sites ( like Kijiji), we pay so our ads can be seen first. Could this be a problem with Google? Some sites send us clients, many of them never do. We keep putting ads there because of their PR. What is the worth of this kind of links? Thanks for your answers.