"I have the Republicans picking up 45 House seats but losing four for a net gain of 41 seats, which is lower than most people," says Ken Rudin, NPR political director.
Whose crystal ball will prove the clearest? →
Mr. Rudin said in the Wall Street Journal that the new technology would expand upon Facebook's ability to collect more of the latter type of data, the behavioral type.
Facebook to track how users hover their cursors →