Grace and Mia are "friends" on facebook.com.They have only met once,but frequently post messages on each other's "wall." Grace and Mia,along with their other "friends," form a

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Grace and Mia are part of a social network on Facebook, where they interact and communicate with each other and their other friends. A social network is a group of people who have some kind of social connections with each other, either through direct or indirect contacts, and communicate through various online channels.

Grace and Mia Are "Friends" on Facebook