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Sisi
Since: Oct, 2012
LadyJuse
Since: Jan, 2010
LadyJuse
Since: Jan, 2010
LadyJuse
Since: Jan, 2010
LadyJuse
Since: Jan, 2010

It was a web game on YTV.com, sponsored by Crush Soda, if memory serves.
It takes place on the last day of summer and you have to work with your friend to throw this beach party/concert.
I feel like there were multiple endings and remember you communicated using emoticons.