The lawsuit, filed in a San Jose, California
federal court on Monday, marks a major escalation of patent litigation
that has already swept up the smartphone and tablet sectors and
high-tech stalwarts such as Apple Inc, Microsoft Corp and Motorola
Mobility Holdings Inc.
patent lawsuit follows Facebook's announcement of plans for an initial
public offering that could value the company at about $100 billion.
Facebook spokesman Jonathan Thaw said Facebook learned of the lawsuit through the media.
disappointed that Yahoo, a longtime business partner of Facebook and a
company that has substantially benefited from its association with
Facebook, has decided to resort to litigation," he said.
In an emailed statement, Yahoo said it is confident it will prevail.
the matter with Facebook remains unresolved and we are compelled to
seek redress in federal court," the company said in a statement.