By Cat Zakrzewski 

LinkedIn Corp. on Thursday reported a surprising increase in its second-quarter profit, a sign that the professional network is seeing success as it shifts strategies in multiple segments.

LinkedIn has been overhauling both its recruiting tools and advertising segments. The company wants users to stay on the site longer and use it as a social platform, not just to update their résumés and search for jobs.

"We saw good progress in executing on transitions across our business," said Steve Sordello, chief financial officer of LinkedIn.

However, LinkedIn continued to see declines in its display-advertising business, which contributed to the company lowering its forecast in April. In the second quarter, display revenue fell 30%, wider than the 10% drop in the first quarter.

Overall, the company's marketing-solutions unit, which primarily sells advertising on LinkedIn properties, saw revenue rise 32% to $140 million.

LinkedIn noted that its sponsored updates had a strong second quarter, more than doubling year over year. The company has been hopeful that a shift toward sponsored updates would offset declines in demand for traditional display ads.

Still, shares of LinkedIn fell 6.3% to $213.05 in after-hours trading after initially rallying more than 10% on its quarterly results.

For the quarter ended in June, LinkedIn reported a loss of $67.7 million, or 53 cents a share, wider than its year-ago loss of $1 million, or a penny a share.

However, excluding stock-based compensation and other items, earnings rose to $71 million, or 55 cents a share, from $63 million, or 51 cents a share, and finished well above the average analyst estimate of 30 cents a share.

Total revenue, meanwhile, increased 33% to $711.7 million, surpassing the company's forecast for revenue of $670 million to $675 million, and the average analyst estimate on Thomson Reuters of $680 million.

LinkedIn said its Lynda.com acquisition contributed $18 million in second-quarter sales.

This was the company's first earnings report since it closed its acquisition of Lynda.com in May for $1.5 billion. The company's largest acquisition to date gives LinkedIn a library of professional training services that it hopes will encourage LinkedIn members to spend more time on the professional network.

On the back of its strong second quarter, LinkedIn raised its full-year revenue forecast to $2.94 billion after cutting it to $2.9 billion in April. The company said it expects per-share earnings excluding items of $2.19 for the full year, up from $1.90.

LinkedIn has been trying to make its site more mobile-friendly. In the second quarter, the company said, 52% of all traffic to LinkedIn came from mobile devices.

Revenue from LinkedIn's biggest division, Talent Solutions, a platform recruiters can use to search for candidates on the site, increased 38% to $443.4 million. The company raised prices for its recruiting platform earlier this year.

LinkedIn also attracts about a fifth of its revenue from premium subscribers. In the second quarter, revenue in that segment rose 22% to $128.3 million.

For the third quarter, LinkedIn projected earnings excluding certain items of 43 cents a share on revenue between $745 million and $750 million. Analysts, on average, were expecting earnings of 43 cents a share on revenue of $744 million.

The company is testing two new apps, following Facebook Inc.'s lead by unbundling its services and offering a portfolio of apps. Still the company lags behind competitors like Facebook and Twitter, Inc. Both saw increases in advertising revenue boosted by mobile in their reports this week.

A recent American Customer Satisfaction Index report found LinkedIn was the lowest-ranking social media site. Premium subscribers paying for extra features gave the company particularly low scores. LinkedIn has been responding to user complaints by retooling its messaging system as well as reducing the number of emails users receive.

Write to Cat Zakrzewski at cat.zakrzewski@wsj.com

Corrections & Amplifications

LinkedIn lost $1 million in the year-ago quarter. An earlier version misstated the figure.

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