Zynga (ZNGA - Get Report) shares plunged in extended trading on Thursday as the social gamer gave a weak outlook. The San Francisco-based firm announced preliminary third-quarter revenue between $300 million and $305 million. Excluding items, the company expects a result between break-even and a loss of 1 cent a share. Analysts surveyed by Thomson Reuters were looking for the Facebook (FB - Get Report) partner to report break-even results on $275.9 million in revenue for the third quarter. For all of 2012, Zynga cut its previous projections for bookings and adjusted EBITDA (earnings before interest, taxes, depreciation and amortization). Zynga's shares lost 12% for the week to close at $2.48.
Also on Thursday, Facebook announced that it has reached the milestone of 1 billion users. "If you're reading this: thank you for giving me and my little team the honor of serving you," explained Facebook CEO Mark Zuckerberg, in a blog post. Facebook shares dipped 3.6% during the week's trading to close at $20.91 on Friday. -- Written by James Rogers in New York. Follow @jamesjrogers >To submit a news tip, send an email to: email@example.com.