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After-hours buzz: Facebook, Pfizer, Lexmark & more

Check out which companies are making headlines after the bell Thursday:

Facebook - The social-networking giant's Instagram announced plans to start using ads in their feed in the next couple of months. Facebook acquired the photo-sharing company last April for $1 billion. Shares of Facebook gained in extended-hours trading.

(Read More: Stocks end lowerafter Capitol shooting incident, shutdown woes; Dow breaks below15000)

Pfizer - The FDA approved the pharmaceutical company's menopause drug Duavee, designed to reduce hot flashes with fewer side effects than the existing hormone-replacement therapies. Shares were flat in extended-hours trading.

Lexmark - The laser printer manufacturer acquired healthcare technology solutions company PACSGEAR in a deal worth nearly $54 million. Shares were largely unchanged in extended-hours trading.

Lannett - The generic drugmaker announced a common stock offering of indeterminate amount through Roth and Canaccord. Shares tumbled in extended-hours trading.

—By CNBC's JeeYeon Park (Follow JeeYeon on Twitter: @JeeYeonParkCNBC)

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