Facebook has begun legal proceedings against another social network, claiming it has infringed on its trademark.
Teachbook is a relatively small site in the US, designed for teachers to share lesson plans, instruction videos and help create courses together.
However, its use of the word "book" in its title has caused a stir at Mark Zuckerberg's company and has resulted in a court filing at a US court in San Jose, California.
"Facebook has become a worldwide social, cultural and political phenomenom," the filing read. "With fame comes irritation. Here Teachbook.com rides on the coattails of the fame and enormous goodwill of the Facebook trademark."
The filing also claimed Facebook had made complaints to the site beforehand but it hadn't taken any action to rectify the situation.
"Despite Facebook's protests, [Teachbook] has wilfully and deliberately persisted in its misappropriation of the Facebook brand," it continued, "forcing Facebook to protect its user community and the strength of the famous Facebook trademark through this action."
We contacted Teachbook for comment on the case but it had not responded to our request at the time of publication.
This isn't the first case of its kind. It was recently revealed BSkyB had launched a number of actions against Skype for its use of the "Sky" trademark.
