Twitter, LinkedIn Corp. (NYSE:LNKD) and ON Semiconductor Corp. (NASDAQ:ONNN) are making big gains this Friday. Posting losses are Yelp, Pandora and GoPro.

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Twitter, LinkedIn Climb

Twitter surged +15.83% early in the day in the wake of its fourth-quarter earnings report, out yesterday. The social media giant posted strong numbers in revenue, though it disappointed on user growth. Tiger Global picked up 500,000 TWTR shares during the fourth quarter of 2013 and as of its most recent regulatory filing still has them.

[drizzle]It’s apparently a good day for social media, as LinkedIn is also posting strong numbers today. About an hour after market open, the stock was trading up +13.84%. This week, the company reported $643 million in Q4 revenue, up 44% from a year ago. Billionaires George Soros and Ray Dalio have small stakes in LinkedIn, with 42,000 and 2,000 shares, respectively.

ON Semiconductor Corp. climbed +12.37% after posting strong numbers on both revenue and earnings for Q4. David Einhorn’s Greenlight Capital initiated a position in the firm during the third quarter of 2014, picking up 15,000 shares. The fund has likely posted a gain on the investment, given the stock’s 35% six-month climb.

Yelp, Pandora Plunge

Yelp plunged -19.4% this morning even after reporting its first ever annual profit. The issue: slowed growth in its users and accounts. Billionaire George Soros has been coming and going on the stock in recent years, and as of the third quarter of last year, he holds 25,000 Yelp shares.

Pandora fell -18.33% early in the day – the result of missed fourth quarter revenue estimates. It also disappointed on Q1 2015 guidance. The internet radio service has struggled on the market in recent months, its price declining more than -50% over the past year. Julian Robertson is a Pandora shareholder.

GoPro’s share price dipped -9.23%. It hit a home run with its fourth quarter results, reporting $633.9 million in revenue and $0.99 in EPS. However, its profit forecast fell below Wall Street estimates. The Tiger Global pick is down -23% year-to-date.

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