How some websites know your Google search queries

Google Chrome is automatically prefetching the first Google result and therefore passing your IP address and search query (in the referrer) to that website's server. It's called Google Chrome prefetch and it's turned on by default.

So while you may not have clicked on that person's LinkedIn or Facebook profile, Google Chrome has already done this for you.

To switch it off: - Chrome > Menu icon > Settings > Advanced > Privacy and security > "Use a prediction service to load pages more quickly", toggle off