The commenting system we use at PPP has always had a block feature, it's functionality has changed. From the developers:

We’ve added an update that changes how user-to-user blocking works:
Previously, blocking was mutual. If user1 blocked user2, neither could see each other’s comments. Now, it’s one-way. If user1 blocks user2, user2’s comments will be hidden to user1. But, user2 won’t notice anything.
Users will now see a descriptive message, instead of the earlier generic one. They can also easily unblock the user.

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The 500 blocks per website per user limit no longer applies. Users can now block an unlimited amount of users.

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Any questions fire away.

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