Tech stocks: Pandora shares plunge

Investors appear worried about the future of Internet radio giant Pandora. Let's take a look at the tech stocks to watch Friday.

Pandora shares slip. Despite second-quarter results that topped analyst forecasts, shares of Pandora are down nearly 9% in pre-market trading. The company predicted an earnings per share of 3 to 6 cents for the third quarter, below the 8 cents investors had predicted.

Overall, Pandora stock has performed quite well in the past year. After hitting a 52-week low of $7.18 in November, the stock has tripled in value.

However, more competitors continue to crowd the field, including Spotify, Rdio, Twitter Music and Google Play Music. There's also talk Apple will enter the market with iTunes Radio, with an announcement expected next month.

Apple steady after new Icahn tweet. Last time investor Carl Icahn tweeted about Apple, the company's stock enjoyed a nice bump. Not this time.

Apple stock is up slightly after Icahn shared details of his dinner with CEO Tim Cook on the possibility of a buyback. "Tim believes in buyback and is doing one," says Icahn on Twitter.

Last week, Icahn revealed he had acquired a large stake in Apple, claiming the iPhone and iPad maker was undervalued.

Follow Brett Molina on Twitter: @bam923.