You'd never be able to observe the results of the changes made by altering the past.
So you're saying that whatever you do, no one can verify any of that? None of the actions you do are ever going to be observable? In other words, for all intents and purposes, you did exactly NOTHING.
I don't see the point. Why would a company pay someone to bring to everyone's attention its failure to deliver an innovative product that many people were genuinely interested in?
In that case, all that should be needed to have the the picture removed would be to tell Facebook to do so
Facebook allows you to "untag" yourself from any photo, regardless of who tagged you. That's already halfway there.
Going any further than that is too complex, as it would require proof that indeed you are on the photo (and that you are who you say you are), which is far from being automated. Furthermore, other people on the photo might want it to stay.
CCs are good for the merchants too:
1) Having less cash to keep and to transfer to the bank means less risk. (They can transfer part of this risk to an ensured security company, that handles the bank transfer, but the amount of cash will affect the price of the security company service.)
2) People are more likely to buy things when they are not limited by the amount of cash they have on person.
Or are you trying to say that lying is, in general, something that is only bad when it is done under oath?
Depends on your definition of "bad". Lying on FB is not illegal, unlike lying under oath.
And what is it if your friends decide to let the world see?
If you wanted it to stay private, but your friends let the world see, then you have a poor choice of friends. It's still your choice.
"You know, we've won awards for this crap." -- David Letterman