The world’s newest mobile handsets and technological advancements were showcased at Barcelona’s World Mobile Conference which took place this week, from February 22 until 25. Facebook’s co-founder and CEO Mark Zuckerberg was among the speakers at the event. The conference was hampered slightly as workers on the Barcelona metro took strike action on Monday and Wednesday. The service did run, but at the minimum service level of 50% during rush hours and 30% at other times.