LinkedIn (LNKD), one of 2013's top performers so far, was among the highly rated stocks hitting a new 52-week high Thursday. The careers-focused social network rose nearly 3% out of the gate in active turnover. It didn't finish that well, however, closing with a fractional gain as volume faded to its average pace. A key catalyst Thursday was Goldman Sachs analysts, who hiked their price target for LinkedIn to 220 from 157. The stock now stands