I don't think it's universal but I've been on sites where I've been forced to enable it to use their commenting platform (cant recall if disqus or intensedebate).
It's either no longer a problem or depends on a site's implementation though because I've used both platforms without 3rd party cookies recently.
It's either no longer a problem or depends on a site's implementation though because I've used both platforms without 3rd party cookies recently.