4/8/2013 5:54:45 AM
facebook uses notifications
but you could miss a reply if it occurs higher in a thread
also what if somebody wants to reply to a reply to a comment? a screen allows not many levels of nesting
with non-threaded all new stuff in a discussion are at the end of the topic
that's why most support and user forums use that, you can visit a topic periodically and still see easily if there are new replies in it
in cliflair we stretch at materials forum because I chose to keep a few main topics and have people reply to them. However the mark as answer admin feature helps me track posts that I haven't yet acted upon
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