In the following video, Motley Fool senior technology analyst Eric Bleeker tells tech investors why this sector has had such a miserable performance so far in 2013. He breaks down the narratives for some of the best players in tech so far, such as LinkedIn (LNKD.DL) and Arm Holdings (ARMH), as well as the worst-performing tech companies of the year, such as Apple (AAPL 0.07%) and Baidu (BIDU -0.22%). Finally, Eric tells us what's behind the over-arching trend of investor fears about mobile instability over the coming few years, and why it is driving down the stocks of some otherwise very impressive companies.