When the boys at school told 5-year old Leanna that superheroes were for boys, her 7-year sister decided that October 1 should be wear your super hero day.

Leanna and AdalinaWhat started out as sisterly love has exploded with the help of social media into a supportive day of geek support and superhero pride.

Folks are encouraged to wear their superhero and post a photo on the Facebook event page or to Twitter or Instagram using . Here are some fun ones from Twitter.