I'm bored and depressed
Zero flyout club of 2013
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Demand side here: We have an offer out to someone that we know also has three other offers. Once he makes up his mind, it will free up three of those slots. This is not overly uncommon. Don't despair yet, the second round will soon be upon us.
(I'll let other demand-side people comment here as well because they might disagree with me, but it might even be worth considering contacting the schools you met with in SD to find out where they are in their process and indicate that you are still interested in their position. This will not bother any school that actually might have an interest in you (even if you weren't among their top choices). It might hurt your bargaining power if they would end up making you an offer, but that probably is not of primary importance to you right now.)