Tech startups Pinterest, Zoom soar in Wall Street debut

Pinterest got off to a flying start on Wall Street Thursday in the market debut for the San Francisco-based visual discovery service, a positive sign for the wave of Silicon Valley firms planning stock listings.Pinterest shares leapt 28 percent in early afternoon trade at $24.16 after its initial public offering (IPO) which raised some $1.4 billion.The jump was a positive sign for other venture-backed Silicon Valley firms after a stumble for ride-hailing firm Lyft, which has lost some 20 percent