Social networking giant Facebook says it filed a lawsuit in California against Teachbook, a yet-to-launch site for teachers, over the use of the suffix "book."

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Facebook said in its trademark infringement lawsuit filed in U.S. District Court in San Jose that the "book" suffix is "highly distinctive in the context of online communities and networking Web sites," the Chicago Tribune reported Thursday.

Teachbook officials said the site has yet to launch and has only two employees and fewer than 20 users. The Web site is designed to allow teachers to share lesson plans and other resources.

"We've been sitting here scratching our heads for the last couple of days," said Teachbook's managing director, Greg Shrader. "We're trying to understand how Facebook, a multibillion-dollar company, feels this small enterprise in Chicago is any type of threat."

Facebook also said Teachbook is offering services overlapping with its own set of features.