Wall Street Roundup: Bernanke’s move. Twitter army.

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Gold: Trading now at $1,504 per ounce, unchanged from Friday. Dow Jones industrial average: Trading now at 12,454.70, down 0.4% from Thursday.

Bernanke’s move. All eyes are on the Federal Reserve and its chairman, Ben Bernanke, who will meet this week to decide on the fate of the so-called QE2 stimulus plan, and will then hold a press conference to discuss it for the first time.

Facing the jury. The trial of Raj Rajaratnam, who stands accused of insider trading, is likely to go to the jury Monday.

Twitter army. Banks are enlisting their customers on Twitter to help them fight against limits on debit card transaction fees.

New savings. In an effort to defend itself against a hostile takeover bid from Nasdaq, the New York Stock Exchange is finding new support for its deal with Germany’s leading stock exchange company.

-- Nathaniel Popper