Amanda Knox trolls Lady Gaga on Twitter

TORONTO -- Amanda Knox, who was at the centre of one of the most publicized murder investigations and trials of the early 2000s, appeared to troll mega-star Lady Gaga on Twitter with a joke about prison Friday. “Fame is prison” Gaga tweeted on Thursday, to which Knox replied “I hear you, but…prison is prison.” Knox spent almost four years in prison after being convicted of murdering her roommate Meredith Kercher in 2007 in Perugia, Italy. Knox was eventually acquit