An Instagram trend of unknown origin has had 1.9 million users join in on the prompt: "We'll plant 1 tree for every pet picture".The thread went viral on the app today, but it is not known who started it, who would be planting the trees, where and how they will plant almost two million trees and counting.Instagram users were puzzled by what one person on Twitter called a "modern mystery".Pet pictures spread like rapid fire on Instagram today, regardless of the trend's truthfulness.People on Instagram are posting images with or of their pets, then adding the 'Add yours' sticker to the story that turns an Instagram story into shareable, interactive thread.
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