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web 2.0 relationships

This week Clay asked us to go to Flickr, Wikipedia, LiveJournal, Facebook, and/or FanFiction to look for some trends. Here are the ones I found

Community of Practice
Flickr categorizes photos by camera used to take the pictures. However, there seems to be very little discussion as to the techniques involved in taking the pictures. These aren't groups people join and have an active role in, it is just a category flickr created.

For active participation there are several specificgroups.

Yes I have a D50.

Personal
So in facebook you have the option to write wall-to-wall messages or send personal messages. I never really understood what the differences were. Some guy would always write me something on the wall that is directed towards me. A few days ago I got a message from a friend that was clearly directed towards me only but it was posted on my wall. I choose to reply via message cause I didn't want people to see what I wrote.

I think what intrigues me is how to people decide which medium to use when they write personal messages on facebook?