It's more or less expected that candidates have one, at least in tech/eng jobs I've looked at. For some, the field to enter your profile URL is required in the form.

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Loughla 5 hours ago | parent [-]

Ew. What purpose does that serve?

	▲	edoceo 5 hours ago \| parent [-]
		It's for the ATS to check out the candidates and scrape attributes to rank them.