Thursday last week, Google (GOOG) experienced a sharp plunge after RR Donnely (RRD) released bad numbers ahead of schedule. But as many have
pointed out, Google's numbers were bad, even without the pre-release
mistake.
This isn't an anomaly in the tech sector, recently the Facebook IPO (FB) dissapointed investors, combined with an IPO tech glitch which had never been seen before in an IPO.
http://seekingalpha.com/article/940291-is-the-tech-sector-going-to-undergo-large-changes
