News bites: Twitter unveils political index

Twitter unveiled the Twindex, a tool to track political opinions on the social-media site.

Sony posted a worse-than-expected 77 percent drop in profit in the second quarter, Reuters reports.

Entrepreneurs are dreaming up creative ways to take advantage of Google's high-speed network in Kansas City, The Wall Street Journal writes.

Facebook's stock continues to sink over concerns about its ability to profit on mobile users, according to Bloomberg.

Top Obama administration officials make a last-minute push for the Cybersecurity Act in a New York Times op-ed.