On this remarkably rare shot (ca. 1951), #JoanMastodon is seen manually following the first #hashtag, way before the feature actually made it to the official release of #Mastodon.
Further evidence that her works were instrumental to the popularity of the network we enjoy today.
(edit: thanks for helping identify, on the right of the picture, that #ClaudetteMastodon herself, the daughter of Joan, is taking the notes of the experiment)