Twitter. It’s not just a social messaging service but a battleground! Rihanna got into a 140-character feud with thoroughly plastic surgery-ed comedienne Joan Rivers after Rivers was aghast at RiRi’s confession to Oprah (that she still loves her abusive ex Chris Brown). Now, Rivers’ ‘Fashion Police’ co-star has thrown her opinionated and outspoken self into the mess. Which side did Kelly O. take?