In the initial times it was known to be for only professors but then @themarkymark made it clear on different forums that its pretty open platform and you can post anything from your pandemic stories to maths problems.

I tried to make it clear over and over it was never meant to be like that but the confusion with STEMSocial was always an issue as they have very strict guidelines for participation.

I always intended STEMGeeks to be hobbyist and amateur friendly.