Have you ever had that freaky experience of seeing an ad for a product on Facebook or through Google just a few minutes after you were talking about it?

It's a pretty common experience these days although no one has ever proved that advertisers are eavesdropping on your conversations. It's more of a case of them becoming so sophisticated, they know what you want without you telling them.

"The magic of targeted advertising is that it should feel relevant to you – even if you can't figure out why," Sean Keach writes for The Sun. "Facebook doesn't need to spy on your real-life conversations, because you hand over so much information anyway."