The following commentary comes from an independent investor or market observer as part of TheStreet's guest contributor program, which is separate from the company's news coverage.NEW YORK (
Twitter rises higher after hits historic gain last week fueled by buyout talks. Tesla shares accelerate, following an analyst report on the company's production schedule.
Apple (AAPL) is developing an extension to its health device app that will provide users with diagnostic health information, not just tracking data.
Tradebird users weigh in with their bullish or bearish opinions on different stocks. Sentiment is turning bullish on Twitter, but Apple doesn't seem to garner much optimism.