Twitter buys 900 patents from IBM to end infringement spat
Found on CNet News on Friday, 31 January 2014
IBM on Friday announced that it inked a deal with Twitter in December that saw the social network acquire over 900 of its patents. The companies also entered into a cross-licensing deal on patents, though details on that agreement weren't announced.
Twitter's patent purchase could help the company defend itself against future patent infringement lawsuits.
So these days you need to secure more than 900 patents to protect yourself from lawsuits when the core of your business idea is to let users post 140 characters of text.