NEW YORK (

TheStreet

) -

Yahoo!

(YHOO)

fell 1.7% in pre-market trading Wednesday, after

announcing that revenue in the fourth quarter

fell year-over-year.

The Sunnyvale, Calif.-based company generated revenue of $1.21 billion, excluding traffic acquisition costs, down 4% from the same period last year. Analysts had expected revenue of $1.19 billion.

Yahoo! posted earnings of 24 cents per share, above analyst estimates of 22 cents per share and ahead of last year's earnings of 11 cents per share.

Google

(GOOG) - Get Report

was up 0.22% in pre-market trading, after announcing that it expects to hire 6,000 new workers this year. 2011 will be Google's largest hiring year in its history, the company said.

3M

(MMM) - Get Report

rose 0.24% to $88.71,

as earnings topped expectations

.

Earnings in the quarter were $928 million, or $1.28 a share, down slightly from $935 million, or $1.30 a share, last year.

Sales rose almost 10% to $6.7 billion.

Nielsen

priced its IPO at $23 per share, above its expected range. The measurement firm raised $1.6 billion on Tuesday.

Online content publisher

Demand Media

upped the size of its initial public offering, and said shares were priced at $17 a piece. The company is expected to start trading Wednesday on the New York Stock Exchange under the ticker DMD.

--Written by Olivia Oran in New York.

>To follow the writer on Twitter, go to

http://twitter.com/Ozoran

.

>To submit a news tip, send an email to:

tips@thestreet.com

.