Twitter has agreed to acquire Bluefin Labs, a Cambridge, Mass.-based social television analytics company. No financial terms were disclosed, but the NY Times reports a price of “nearly $100 million.” Bluefin has raised over $20 million in VC funding from firms like Kepha Partners, Lerer Ventures, Redpoint Ventures, Acadia woods Partners, SoftBank Capital and Time Warner

Google (Nasdaq: GOOG) has acquired Channel Intelligence, a provider of technology services that drive online purchases, from ICG Group Inc. (Nasdaq: ICCE) for $125 million in

Liberty Global (LBTYA) has agreed to acquire UK-based cable company Virgin Media (VMED) for $23.3 billion. Read more.

Reliance Steel & Aluminum Co. (NYSE: RS) has agreed to acquire Metals USA Holdings Corp. (NYSE: MUSA) for $766 million, or $20.65 per share (13% premium to yesterday’s close).

Solera Holdings (NYSE: SLH) has acquired HyperQuest Inc., a Buffalo, N.Y.-based provider of property and casualty insurance software. No financial terms were disclosed. Sellers include New World

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