With AROUNDMe you can create one or many webspaces (web sites). In each webspace you get tools such as a wiki, blog and forum from which you can build your social space!
You can make your webspace private meaning that only those people that you invite in can see your webspace or open meaning that anyone can see it.
With open webspaces anyone with an OpenID can connect to your webspace and join in the fun if you have given them permissions to contribute.