Had a thought about SL, which in many respects picks up on a very "Real Life" (RL) insight. When we have life experiences - vacations, family in town, trips to exotic places etc., we're all about immortalizing the moment and preserving it through film, photographs, video etc.
SL is the exact same.
The art and act of freezing time as it were and capturing the moment in a snapshot is not only extending the experience...and keeping it alive...but in more practical terms, feeding the long tail through Flickr, tagging, blogs etc.
It also very much counters any perceived limitations of yuckky reach due to sim restrictions etc. For example: crayon's launch had a capacity-filled 57 avatars on hand, but has since been shared with thousands upon thousands of others who not only didn't attend the event..but also aren't even in SL in the first place.
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