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It's not required. Voluntarily providing validation serves only as a means to provide some additional evidence of knowledgeably.

I should have specified--the question was for @business. I was once asked to post a photo of myself holding a sign for verification purposes.

I'm just going to second @justtryme90 in certain contexts proof of expertise could add value to a post; for example if interested parties were wanting to make important decisions based on the opinion of a poster.

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