I had this idea...
We could test how well VI of pictures works, if someone posts pictures of 5 friends of him/her on the 'what's my type' section. He/she knowing already their types with a 100% certainty.
We then could all give our opinion on what type those persons probably are by using VI.
In the end we can conclude how useful VI actually is, by looking at the scores of everyone. Next to that it may shed some light on how well you are using VI.
Maybe some interesting conclusions can be drawn like for example, if everyone is wrong 95% of the time, then we might stop using the picture VI stuff, or maybe we find that someone on this site has everything right, making him/her opinion very trustworthy in that area.
What do you think, would it be a nice experiment? Or have any suggestions/remarks?