Even as American technology bosses are exploring China, some of those esoteric local firms are bursting to get out. A moratorium, only recently lifted, on initial public offerings on mainland exchanges has led to a big backlog of IPOs. So China’s best online firms are now hoping to list on American exchanges. In January JD, an e-commerce firm akin to Amazon, launched a share offering in America that may value the firm at $20 billion. On March 14th Sina Weibo, the nearest Chinese equivalent to Twitter, announced an IPO that would raise up to $500m, reportedly valuing it at around $7 billion.  The Economist reports.