There have been multiple accounts created with the sole purpose of posting advertisement posts or replies containing unsolicited advertising.

Accounts which solely post advertisements, or persistently post them may be terminated.

wim ,

Sorry, I should have included an example in my comment to clarify, but I was in a rush.

HMAC is a widely used technique relies on hashing of a shared secret for verifying authenticity and integrity of a message, for example.

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