Facebook and Adblock Plus are engaged in a little turf war.

On Tuesday, the social giant let users know that it had made it impossible for ad blockers to determine the difference between an ad and an actual post on the site, effectively making them useless on Facebook. Facebook instead offered users the option to fine tune the ads they saw while perusing the social network.

It didn’t take long for the ad blocking community to fight back, with Adblock Plus issuing a fix just days later. Facebook wasn’t going to take that lying down, though.

In IT Blogwatch, the game of cat and mouse has begun.

What exactly is going on? Mark Wilson gives us the background:

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