Beware of technology's 'black ice': Analyst By: CNBC.com News March 21, 2015 at 11:03 AM EDT UBS senior analyst Brent Thill says some hot tech names look good on the surface, but just like a patch of black ice, could cause an avalanche. Read More >> Related Stocks: Fireeye Inc Intuit Microsoft Oracle Corp Palo Alto Networks Inc Servicenow Inc Splunk Inc Tableau Software Inc Cl A