There are many a thread running where the OP comes on, asks for advice and opinion and for 2 weeks the thread is buzzing with responses yet the OP never once returns. Not to add clarity, not to say thanks, etc.
Surely MN could have a way to pull up all thread where the OP hasn't returned in (say) 2 weeks/50 replies and auto delete them? Even if just for the main AIBU/Relationship/Parenting ones?