Speculation: face shape categories (oval, round, square, heart, inverted triangle), trending along with TikTok AI face-shape filter videos plus hairstyle recommendations by face shape. Under the same root, 'inverted / upside down triangle face shape hairstyles male' (30-day +50,000%) is also rising. Searchers want to know their face shape and what hairstyle suits them, so an AI tool site that lets you upload a photo to detect face shape and recommend hairstyles could work. The exact starting point isn't clear yet; waiting to verify whether this is a new wave.
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