Danah Boyd on Social Networking sites
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Persistence - what you say stays around. Conversations in a park disappears once the conversation finishes.

Search-ability - people can be found eg marketers, teachers, authority. People go to physical places to avoid people such as these. Can't escape online

Replicability - People can copy and paste conversations to a more public environment.

Invisible audiences - in real spaces we modulate our voices but online this tends to change

People have 'friends' online as a way of imagining the audience of friends - gives a sense of our audience. How can people be simultaneously cool to parents and friends online?

How are people creating who they are in an online public world?

Social networking becomes the primary place of public 'hang out' for teenagers in the US because there are less places in public for young people to hang out in the real world.