Oh, I see that our beloved Shiro hasn´t pulled the trigger - I´m so happy about it! Don´t fall into despair because of those bad spammers besmirching the purity of our main board, Shiro! May the force be with you - the force to sage!
>>1 There is a thread about "Dirty Secrets and Embarrassing Confessions" on Random - I guess it´s similar to your idea. Well... at least not totally different.
http://dollars-bbs.org/random/res/1320523638.html
If not, I´d also suggest to create a new thread instead of using instagram. Not that I don´t like instagram, I simply don´t use it.
By the way, the idea sounds fun, especially if we´d collect funny stories.