Online radio company Pandora ( P) is down 30% from its June IPO, trading at around $12.11 as of Tuesday afternoon. Business social network LinkedIn ( LNKD), meanwhile, has fallen 15% from its May debut, trading at around $80 in afternoon action. -- Written by Olivia Oran in New York. >To follow the writer on Twitter, go to http://twitter.com/Ozoran. >To submit a news tip, send an email to: firstname.lastname@example.org.