Possible? Yes. Time consuming and expensive? Also yes.
Also, remember that altering the database tables isn't a good idea, since that can make future upgrades difficult. When you are modifying, you always want to add, not change.
This would cause some issues, since we sometimes want the posts separate if there's a good reason. Perhaps allowing users to self merge their posts if they wanted to would be the solution though.
Those are nice. And some people were worried that we couldn't make the evening gown theme sexy...
It's a good idea.
Quote walls are fine. Keep up the good work.
Those count!
I'd let anyone cute suck
my dick.
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You need a dick?
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Fun gif, but we need to fix your signature...