As Facebook grows in US, Twitter goes flat - Silicon Valley / San Jose Business Journal:

The September numbers from market watcher comScore show Facebook Inc.'s U.S. user number grew 4 percent to 95.5 million as Twitter Inc.'s numbers flattened out at about 20.8 million.

The gap between Palo Alto social networking company Facebook and San Francisco micro-blogging service Twitter has grown by about 50 percent from April to September. Facebook's 50 million user lead has grown to about 75 million over the summer, according to the comScore report...