Now you can easily create unique feed URLs for each registered user in your WordPress site simply by adding Feed Keys to the end of the existing feed URL. Unique Feed Keys are made by hashing username or email against a randomly generated key. You can choose the key length and algorithm to use to hash the salt and the key together using new WordPress plugin called Private Feed Key. It adds adds a 32bit (or 40bit) key for your website users and creates a unique feed URL.
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