Shares of social-media companies Reddit Inc (NYSE:RDDT) and Snap Inc (NYSE:SNAP) are surging today after earnings. The former reported its first quarter of profitability and said revenue for the fiscal fourth quarter would be above estimates, while the latter beat third-quarter expectations and announced a $500 million stock buyback program. At last glance, Reddit stock was up 35.3% at $110.61, and earlier touched an all-time high of $114. RDDT, which went public in March, is up 144.6% over the last six mon ...