Facebook's response has been added to this story.

NEW YORK (

TheStreet

) --

Seagate

(STX) - Get Report

was one of tech's big gainers in premarket trading on Tuesday, rising 3.01% to $23.97 as the company prepares to

join

the

S&P 500

.

The hard drive maker will replace

Progress Energy

(PGN)

after the close of trading on June 29, S&P Indices announced after market close on Monday.

Also on Monday, Seagate announced a strategic agreement for the development of solid state drives for the consumer and enterprise markets with Israeli company

DensBits Technologies

. As part of the deal, Seagate has made an undisclosed equity investment in DensBits.

Seagate was also one of the most active premarket

Nasdaq

stocks on share volume of 312,562.

Facebook

(FB) - Get Report

climbed 1.06% to $32.40 before market open as investors digested the company's

expansion

of its ad network.

"People may now see ads and sponsored stories from Facebook on Zynga.com," explained a Facebook spokeswoman, in an email to

TheStreet

. "We don't share any information about people or advertisers with Zynga and advertisers do not have any new targeting criteria."

The social networker, which

added

Chief Operating Officer Sheryl Sandberg to its board on Monday, was also an active premarket Nasdaq stock on share volume of 90,981.

Facebook partner

Zynga

(ZNGA) - Get Report

rose 2.89% to $6.24.

--Written by James Rogers in New York.

Follow @jamesjrogers

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