At a community meet-up, users from a virtual world or community, who normally communicate only online, meet in real life.
A community in the general sense is a gathering of people.
A social network is a online community where people can meet and interact with one another.
A community blog is a diary or column which is regularly updated with different content such as commentaries, description of events, videos or other graphics.
A 3D community is basically an online virtual world where users can create an avatar and interact with one another.
A profile is a description of a user in an online community, virtual world or social network.
An online community is a platform where people can meet to discuss different interests, themes or hobbies.