I personally don't have any sites to get Ambassador but I know there's quite a few of them.
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Roblox was made in 2005, yeah it's pretty good.
Roblox Assault Recon
Royal Roblox Peacemakers (RRP)
Yes.
No, Roblox is not bad for children. It helps make a creative mindset, and has a good moderated environment. Everything on Roblox is moderated to be G rated.