Answer A Piczo site is ...
Piczo is an online photo website builder and community,
where people can sign up for free to make their own
Definition is from the Wikipedia.org site
Don't know about advertising supported? The adverts support Piczo and are really annoying because you need to have Ultimate Rainbow Badge to get rid of your ads.
It's safe for kids if they don't put on any personal details, but there is a 13 age limit. (I had one at 11 and I'm still here.)