SAN FRANCISCO (Reuters) - SoftBank Group Corp has invested $300 million in shared-office space company WeWork, the first installment of a multi-billion-dollar bet, according to a source familiar with the matter.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=afsZ8_La_9M:mqmSuXAeoKY:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=afsZ8_La_9M:mqmSuXAeoKY:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=afsZ8_La_9M:mqmSuXAeoKY:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=afsZ8_La_9M:mqmSuXAeoKY:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=afsZ8_La_9M:mqmSuXAeoKY:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/afsZ8_La_9M" height="1" width="1" alt="" />