WordPress DDOS potential overplayed?

That is what Jason Cohen (CTO of WP engine) is saying at blogs.csoonline.com

He also said: (what the pingback function does, calling it “an altruistic, friendly, social system.”)

What can happen is a lot of pingbacks with the links in the comments.  If done  on many pages with a lot of effort it can happen. I recommend everyone use moderated comments to prevent automated bots if you must turn on pingbacks.

And remember – you can always turn off pingbacks.  In Settings–> Discussion Settings

we have no pingbacks in our WordPress sites.

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