bbc action line on your search engine. stay with us on outside source still to come. the russian teenager leads the competition for the women s singles skating title at the beijing olympics as the controversy of the doping dispute continues. the online game roblox is played by millions of kids around the world. however, a bbc investigation has found users creating games on the platform where avatars can undress and have sex. child safety campaigners say row blox needs to do more to protect children. here s james clayton. this is roblox, one of the most popular online games in the world. users don tjust play games, they can create them too. roblox is based here in silicon valley.