Google has done it before and now Facebook seems to be doing it.
Facebook is reportedly buying around 750 patents from IBM to counter the patent infringement lawsuit filed by Yahoo against it.
Google has in the past acquired thousands of patents from IBM to counter similar lawsuits targeting their Android platform.
The deal is currently a rumor though we would find out soon enough.
Facebook just recently launched their IPO and this is a real bad time for them to face a lawsuit like this. But looking at the resources they have and they are trying to acquire, they should be well prepared to take on Yahoo.