European tech hubs hoping to rival Silicon Valley By: CNBC.com News April 10, 2014 at 04:37 AM EDT "Silicon Allee" may not have the same ring as Silicon Valley, but California's success has spawned would-be "Silicons" across Europe. Read More >> Related Stocks: Apple Astrazeneca Plc ADR Criteo ADR Representing Ord Shs Facebook Google, Inc. Hewlett-Packard International Business Machines King Digital Microsoft Motorola Solutions Oracle Corp SAP Ag ADR Sony Corp Twitter, Inc. Yahoo Zynga Inc Cl A