Jacinda Ardern has taken a swipe at keyboard warriors.

The Prime Minister gave the commencement speech at Harvard this morning, speaking to roughly 8,000 graduates and their families.

A key theme of her speech was rallying against misinformation and calling out social media to do its part to shut it down.

She also took a swipe at those who deliberately peddle misinformation, the 'keyboard warriors'.

Jacinda Ardern says when she sees abusive comments online she imagines it's written by a lone person unacquainted with personal hygiene practices, dressed in a poorly fitting super hero costume.

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