[June 17, 2011] Facebook Leads Nonfriend Field As We Rank Tech's Testiest Titans Tweet (Benzinga Lightning Feed Via Acquire Media NewsEdge) Ali vs. Frazier. Yankees vs. Red Sox. Bird vs. Magic. Sports are full of great rivalries. So is the fast-paced, ultracompetitive tech industry. Some rivalries get nasty, with executives bad-mouthing opponents, running attack ads and filing lawsuits. Some rivalries cool over time, while others go on for years -- depending on circumstances. Wireless carrier T-Mobile USA had been running ads mocking AT&T's (T) service. But when AT&T announced its [ Back To TMCnet.com's Homepage ]