Discusion sites...how many do you use???

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I am on MyLot and enjoy it more than any other site. I am also registered on Facebook but hardly use it, it's boring. I did register at another discusion site once, long ago but never got active. I can't remember the site name but I do remember it looked too complicated. MyLot is simple and easy to use. Are you using other discusion sites, and if so, how does it compare?