I bake with my boys - lots of reasons. The maths, food science, fine motor skills and reading all come into it, but it's also something I love doing and it's time we can spend together talking about anything and everything.
We started off with them standing on the kitchen steps so they could reach the work surface - DS1 at 9 is almost tall enough not to need them now, DS2 at 7 still uses them - and making simple cakes. The recipe for a basic sponge is straightforward, they are fairly difficult to get disastrously wrong, they take a very short amount of time to cook and you can watch them rising in the oven, they can be messily decorated and still look at taste fab - so it's like reasonably fast gratification for not much effort :) We then extended that to more complicated cakes and biscuits, and from there to every day cooking.
Now the boys will often help me make dinner - they can make a reasonable cheese sauce, a range of breakfast type stuff, bolognaise sauce, pizza (although I do make the tomato sauce topping as a batch every now and again so they just have to make the dough, spread it over and sprinkle cheese and basil on!) - I'd like them to be self sufficient when they leave home without relying on fat and salt laden processed ready meals.
I also really don't mind all the mess. It all gets cleaned up at the end and it's fun for them to play in a sink full of hot soapy water while things are in the oven. Floors can be mopped, surfaces wiped, pans in dishwasher, kettle on :)
I don't tend to post pics on FB of it though, not sure what the benefit of a photo of a pizza is! I post the birthday cake pics every year for family (they live a long way away so they get to see the cakes that way) - mostly when I post pics of the boys it's them doing something sporty or when we go for walks because the scenery where we live is stunning.