A sign is pictured outside a Google office near the company's headquarters in Mountain View, California, U.S., May 8, 2019. Photo taken May 8, 2019. REUTERS/Paresh Dave/File Photo Purchase Licensing Rights, opens new tab BRUSSELS, Jan 17 (Reuters) - Alphabet's (GOOGL.O), opens new tab Google will tweak online search results to give comparison sites more prominence, the company said in a blogpost o