Snapchat owner dials down IPO valuation to maximum of $22.2bn but may still break US tech record

Snapchat has set its IPO valuation as high as $22.2bn, dialing down its previous ambitions of hitting $25bn but still putting the company on track to be one of the biggest tech floatations the US has seen. 
The industry has been keeping a close eye on Snap Inc since the upstart published details of its forthcoming IPO back in January in the form of an S1-filing which promised growth but not profit in the short-term. 
According to the Financial Times, Snap is due to host