People have been referring to Porsches as P-Cars/PCars/P Cars (what have you) since at least the early 2000s (over 15 years ago), well before Facebook, Instagram, Twitter, and hashtags were a thing in the public.
I would say it was initially popularized on car forums (particularly BMW discussion boards during the E46 days) and then subsequently picked up as an easy and catchy hashtag by social media.
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