By Angela Chen And Yoree Koh 

Twitter Inc. on Tuesday gave downbeat sales guidance for the current quarter and year, as first-quarter revenue rose less than expected, following disappointing results from some of its newer products.

Shares plunged in late-day trading, falling 18% to $42.27, it's second-worst day ever by percentage. The quarterly report--expected after the market close--came out earlier when the website Selerity found the company's earnings release online and began reporting the company's results in tweets.

Twitter Chief Executive Dick Costolo said in the company's news release, "Revenue growth fell slightly short of our expectations due to lower-than-expected contribution from some of our newer direct-response products."

Some of the new products Twitter has introduced include video functionality, the "while you away" recap feature, instant timelines and group direct messaging.

The San Francisco-based company is under intense scrutiny as Mr. Costolo and his new leadership team tries to show investors that they still have ways to reinvigorate user growth and generate the kind of revenue that matches the powerful platform's cultural influence.

In the latest quarter, the number of Twitter users who log in at least once a month rose to 302 million in the March quarter, up 18% from the prior-year period.

For the current second quarter, the company expects revenue between $470 million to $485 million, below analyst estimates of $538 million. For the full year, the company expects sales of $2.17 billion to $2.27 billion, again below analyst estimates of $2.37 billion.

Separately, the company said that it has agreed to acquire marketing company TellApart Inc. and will partner with Google's DoubleClick advertising platform. Financial terms of the TellApart deal, which is expected to close around June 1, weren't disclosed.

Twitter has yet to eke out a profit amid ongoing investments on new data centers, office expansion and talent.

For the latest quarter, Twitter reported a loss of $162 million, or 25 cents a share, compared with a loss of $132 million, or 23 cents a share a year earlier. Excluding stock-based compensation and other items, the company's per-share earnings rose to seven cents a share from zero cents a share in the prior-year period.

Analysts, on average, were expecting earnings of four cents a share, according to Thomson Reuters.

Revenue increased 74% to $435.9 million. The company had expected earnings between $440 million to $450 million, while analysts surveyed by Thomson Reuters estimated, on average, that Twitter would post revenue of $456.8 million.

Advertising revenue grew 72% to $388 million, with mobile advertising revenue comprising 89% of the amount. International revenue more than doubled to $147 million.

The San Francisco company's maturing advertising business, which comprises the bulk of its revenue, is making further headway, riding the wave of advertising dollars shifting to mobile and social platforms.

Less than an hour before the market's close, Selerity--a New Jersey firm that crawls the Web for financial data-- began reporting Twitter's earnings numbers in multiple tweets. The firm says its Web-crawling software found the link to Twitter's news release announcing the earnings on the company's publicly available investor relations page.

"There is occasional scraping that occurs," said Brendan Gilmartin, Selerity's executive vice president of content and client services, in an interview. "In this instance, we noticed that the results were available."

It wasn't clear when Twitter may have first inadvertently published the link and if it removed it once Selerity started tweeting the results. Twitter has said it is investigating the leak.

Write to Angela Chen at angela.chen@dowjones.com and Yoree Koh at yoree.koh@wsj.com

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