I have been blocking 3rd party cookies for years. The only site that has ever had a problem was my local power company (aps.com). However, it was easy to get

I have been blocking 3rd party cookies for years. The only site that has ever had a problem was my local power company (aps.com). However, it was easy to get around because even though their site warned that 3rd party cookies were required, you could just click around it to pay your electrical bill. I've never had a problem on any other sites that I use in at least five years, though I suspect it's been more than that.