IBM Claims Twitter Infringes On At Least 3 Of Its Patents

Oh yes. Always been using IBM for that!

The U.S. patents in question:

6,957,224: Efficient retrieval of uniform resource locators; https://www.google.com/patents/US6957224

7,072,849: Method for presenting advertising in an interactive service; https://www.google.com/patents/US7072849

7,099,862: Programmatic discovery of common contacts. https://www.google.com/patents/US7099862