Grey hat SEO techniques fall between ethical white hat methods and unethical black hat practices. These techniques push the boundaries of search engine guidelines without outright breaking them. One example is buying old domains with backlinks to boost rankings. Another is publishing spun content, which slightly modifies existing content to appear unique. Using clickbait titles to drive traffic is another grey area. Social bookmarking on multiple platforms for backlinks can also be considered grey hat. These methods carry risks, as search engines may penalize sites if they detect manipulation. You should focus on sustainable SEO strategies for long-term success.