J.K. Rowling and the movie version of "Harry Potter." Image via Twitter
J.K. Rowling and the movie version of “Harry Potter.” Image via Twitter
Muggles and stars alike were wishing “Harry Potter” author J.K. Rowling happy birthday on the last day of July — the same day she assigned the birth of the boy wizard.

A review of Twitter greetings reveals the vastness of the British author’s literary universe and commercial connections.

But no wonder — the Potter series is the best-selling in history, with more than 400 million copies snapped up since 1997 and a global brand worth an estimated $15 billion.

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