Have you noticed your friends aren't posting anymore on myLot?

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I try to answer my friends discussions as much as I can, and that's why they're on my list. Not only that, but because we have things in common. I just noticed about 5 of them aren't posting anymore, and they haven't contacted me to tell me why. Should I take them off my list? Have you taken anybody off because they're gone? Our friends list can get pretty big, and it can be a pain trying to weed through them all to see who's posting.