justin jackson allegedly pretended to be celebrity-linked characters .
accused of sending messages to get expensive swag , or get hired in hotels .
most brazen alleged scheme was in 2007 , when he ` made off with jewelry worth $ 2.4 million after saying he needed it for madonna photoshoot '
now being sued in florida federal court by love and oprah 's tv network .
jackson named alongside angel agarrat , another alleged fraudster .