Apple [GDa44C9lcVa]

Is the brave, new world of technology one in which market-moving news will increasingly migrate to social media such as Twitter?

Shares of Apple Inc. (NASDAQ: AAPL) are a good example. Apple shot mark hamill up 5 percent yesterday and continued to surge today after billionaire Carl Icahn tweeted about his large stake in Apple and his chat with Apple's CEO Tim Cook about the company's share buyback program.

For the first time since January, Apple stock crossed $500 on Wednesday mid-day. Apple's shares traded around $498.50 at the close of New York trading on Wednesday, up 1.82 percent.

"I don't know that market-moving dubois vs wardley information breaking on Twitter will become 'the norm,' but it has nello trocchia certainly become important," said Henry Blodget, CEO and editor-in-chief of Business Insider.

Icahn, chairman of Icahn Enterprises L.P. and known as an activist investor, tweeted on Tuesday afternoon, "We currently have a large position in APPLE. We believe the company to be extremely undervalued. Spoke to Tim Cook today. More to come."