By Chelsey Dulaney 

Yelp Inc. shares fell to their lowest level in two years on Wednesday after the reviews site cut its revenue guidance for the year, fueling concerns about its ability to grow.

The slash to top-line guidance comes as the online-reviews company has seen competition heat up--not just for dollars, but for eyes and talent--as search giant Google Inc. has ramped up its own listings and visitor growth has slowed. The stock now is worth about a quarter of its all-time high, reached just last year.

On Tuesday, Yelp delivered a roughly 5% cut to revenue guidance, forecasting a range of $544 million to $550 million. The company also said it would cut its branded-advertising product, which has been struggling as people shift away from traditional digital display ads to performance-based advertising products.

Shares of Yelp fell as much as 29% in morning trading Wednesday, erasing more than $700 million from its market value. Recently, shares were down 28% to $24.13 a share. Yelp's stock peaked at $101.75 a share in March 2014.

San Francisco-based Yelp, started in 2004 when former PayPal executives created a website to replace word-of-mouth recommendations, is seeing its growth slow three years since going public.

Though the company continues to see more visitors, especially for its mobile app, the rate of growth has decelerated. It is also struggling to grow its sales force, while tension between the company and search giant Google Inc. has intensified. Google has pushed further into its own listings for restaurants and other local points of interest, while Yelp executives have complained that Google has altered its search results, directing users to Google's own local listings.

Yelp attributed its revenue outlook cut on Tuesday to slower growth in sales force hiring and the phasing out of brand advertising, which made up about 6% of revenue in the latest quarter. Yelp said cutting the disruptive display ads, which can launch intrusive video or audio and take a long time to load, should improve the customer experience, especially within the app. The company now plans to focus on local advertising.

Meanwhile, some analysts were discouraged by Yelp's traffic in its second quarter.

Traffic growth has been a concern for investors lately, and the company said in April that it would stop providing total monthly unique visitors, focusing instead on desktop and mobile monthly unique visitors.

The company said Tuesday that monthly mobile unique visitors rose 22% from the prior year, to about 83 million, on a monthly average basis. Still, that represented a slowdown from the 29% year-over-year increase in users it posted in the first quarter and its 37% increase from the fourth quarter.

Local advertising revenue grew 43% to $107.9 million in the quarter, also a slowdown from the 51% year-over-year growth in the first quarter and the 60% growth in the fourth quarter.

In a research note, Northland Capital Markets analysts said decelerating user growth could drive the company to spend more on marketing. Yelp said on a call with analysts Tuesday that it is planning to ramp up marketing in the second half of the year, including through TV ads.

Another challenge: Yelp appears to be losing out in the ultracompetitive scramble for talent in Silicon Valley. Yelp on Tuesday cut its expectation for sales head count growth to 30% this year from 40%.

"Coupled with the strength in the tech sector, particularly in San Francisco, we have not grown the sales team as quickly as planned," said Chief Financial Officer Robert Krolik on the Tuesday call.

Analysts at Cantor Fitzgerald expect the lower head count to damp revenue growth. But Cantor Fitzgerald still sees opportunity for Yelp.

"The local online ad opportunity remains substantial and the number of players with scale, brand and network effect is limited, in our view, positioning Yelp as a prime beneficiary both as an operator and an acquisition target," Cantor wrote.

The Wall Street Journal r eported in May that Yelp was exploring a sale, but amid more recent reports of a stalled sales process, B. Riley & Co. analyst Sameet Sinha downgraded Yelp, saying the paused effort put "deteriorating" fundamentals in focus. Mr. Sinha has said that "fickle" small businesses pose a risk to the company.

Write to Chelsey Dulaney at Chelsey.Dulaney@wsj.com

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