Thanks for your advice guys. I used to do a lot of link exchanging with other gambling related sites, but then I noticed that many of my link partners either didn’t add my link or quietly removed them shortly afterwards. Since then, I’ve been link building via article and directory submissions. They’re great ways to build one-way links and I don’t have to worry about giving other sites links and wondering whether my links have been removed or not. I still have a few gambling link partners, but then the majority of my links come from article and directory sites.