Thanks Alan. I know stock doesn't really pay and have never been interested.
I first thought it said 'Picasa' which I had heard of, but it is 'Pics a stock' which made me a bit suspicious. Thought it was someone setting up stall and 'borrowing' the Picasa name.
But it is an existing website, just had a look at it. Sadly you cannot get access unless you register, so I tried to amuse myself with the terms and conditions.
A lot of legalese that would take me a day and a half to read, with my eye problem. So I cherry picked and think I'd get 20 dollar cent per granted licence or something similar. But you seem to be able to withdraw with six days notice, so that sounds rather healthy. Unless there are legal snakes in the grass of course.
I'll have to have a think and let someone else go through it.