Upgrades for JetBlue, Twitter and Bank of America in Thursday's Anaylsts' Actions. JetBlue (JBLU) was revised higher to MARKET PERFORM from UNDERPERFORM from Raymond James. The analysts there say it was based on valuation and think the carrier has leverage to lower fuel prices. Twitter (TWTR) is now rated at OVERWEIGHT from NEUTRAL at JPMorgan. The price target was also raised to $64 from $54. The firm thinks Twitter is the 'primary beneficiary of the shift toward mobile advertising.' Bank of America (BAC) got an upgrade to BUY from NEUTRAL at UBS with a price target increase to $20 from $16.50. UBS expects BofA to benefit from rising rates on its deposit profile.