JOHANNESBURG (Reuters) - South African shares followed global stock markets lower on Friday, as traders grappled with an outage of Bloomberg financial terminals and fears of a regulatory clampdown on trading in China. Shares in media and e-commerce group Naspers Ltd, South Africa's biggest firm by value, led the decline, falling 3.4 percent as its fortunes are closely tied to those of China's Tencent Holdings, in which it holds a minority stake. Tencent, one of China's largest Internet companies, has been a lucrative bet for Naspers but its shares fell 1.2 percent, while China's H-Share index futures HCEIc1 were down more than 5 percent, pointing to a potentially big sell-off on Monday. Markets were spooked by reports of a crackdown in China on over-the-counter margin trading and regulatory allowances for fund managers to lend shares for short-selling, as this could staunch the flow of money into Chinese exchanges. Traders also said Naspers was due for a pull back after its shares surged past 2,000 rand for the first time on Monday. "People think the share had overshot a little bit, too high too quickly," Cratos Capital's, Greg Davies, said. Petrochemicals group Sasol, which is repatriating 340 South Africans working at its projects in Mozambique over security fears, fell 2.4 percent. Sasol said as a result of the repatriation, work at some of its projects had been halted temporarily. The benchmark Top-40 index ended 1.07 percent lower at 47,491 while the broader All-Share index ended almost 1 percent down at 53,734. Activity was slightly above average, with 190 million shares changing hands.