At 9:02 a.m., the Seahawks tweeted that playoff tickets were on sale. At 9:28 a.m., they tweeted this:
NFC Divisional Playoff game at @CenturyLink_Fld is sold out.— Seattle Seahawks (@Seahawks) December 31, 2013
A quick note about this: The tweets have earlier time stamps on Twitter than the embedded tweets, that’s why there is a time discrepancy. Presumably, this is a Twitter issue. The prevailing point here is tickets sold out in less than 30 minutes.