The warning came in the company of Mark Zuckerberg at the end of last month.
Yahoo has responsibilities to its shareholders and employees, among others, the protection of intellectual property.
They referred to the alleged infringement of some 20 patents by Facebook.
Both companies, business partners, then held a meeting to try to clarify the situation on technical mechanisms used by social network advertising.
Privacy settings and notifications and messaging services whose intellectual property, according to Yahoo, they own it.
As often happens in these stories, where one says white to get some benefit, the other black crying, not wanting to give anything. So you get to court, as reported Reuters.
With an initial reduction compared to the points made in the first instance, Facebook Yahoo berates violation of 10 patents, so that both companies face off in court.
A new battle begins in warfare technology patents.
Doing a quick review of the artillery of the two involved, Facebook has only 56 U.S. patents issued in late 2011, a figure certainly negligible compared to more than 1,000 of which Yahoo has.
On the other side of the coin, however, Yahoo does not enjoy the good health of the vast social network today.
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