Social media stocks rallied after Snap Inc. reported third-quarter revenue and user growth that beat analysts’ expectations, suggesting resurgent advertising spending. Pinterest Inc. (NYSE: PINS) surged a record 14% on Wednesday, getting an extra boost from two analysts who raised their ratings on the company to buy. Both cited Snap’s results. Pinterest, which said it added media industry veteran Salaam Coleman Smith to its board of directors on Tuesday evening, is next to report earnings on Oct. 28. Stocks are up 165% since the beginning of the year and 415% since March lows.