Investors loved Facebook's (META 2.48%) first-quarter results. Shares jumped about 7% following the quarterly update, which showed better-than-expected revenue and adjusted earnings per share.

But there's more to the quarter than a strong top- and bottom-line performance. Investors can find particularly interesting insights about the social network's business in its first-quarter earnings call. Three interesting topics discussed during the question-and-answer session with analysts include stories, payments, and management's outlook for revenue.

Facebook CEO Mark Zuckerberg discusses the company's 10-year roadmap at F8 2018

Facebook CEO Mark Zuckerberg. Image source: Facebook.

Stories: An "increasingly important growth opportunity"

Beyond better-than-expected top- and bottom-line results, the other key metric that may have played a key role in the stock's sharp rise after quarterly results were posted was Facebook's achievement of half a billion daily active users on each of its Stories experiences, including Facebook and Messenger, Instagram, and WhatsApp.

With so much user engagement, it's no surprise that the Stories format is a key growth opportunity for the company.

"Facebook and Instagram feed ads make up the bulk of our business today. We expect that to continue, but Stories are increasingly important growth opportunity," said Facebook Chief Operating Officer Sheryl Sandberg. "We are helping advertisers keep up with the shift in how people are sharing, just as we did with mobile."

She added that there are now 3 million advertisers using Stories ads.

The rise of commerce and payments on Facebook

Another area of opportunity for Facebook -- but one that will take more time -- is commerce and payments.

Facebook CEO Mark Zuckerberg explained:

[A]dvertising is going to be the way that the revenue comes in for the foreseeable future, but what we expect is as we build out more commerce-related features around shopping and Instagram and Marketplace and Facebook and certainly the private social platform that ... I've been talking about, I think will lend itself to private interactions around payments and commerce and interacting with businesses in that way.

But investors will need to exercise patience. In the near term, the company plans to offer these features at cost, or even for free, in order to prioritize the experience for small businesses.

Decelerating growth

In Facebook's first quarter, revenue increased 26% year over year -- a deceleration from 30% growth in the prior quarter and 33% growth in the third quarter of 2018. Looking ahead, Facebook CFO David Wehner said he expects this trend to persist.

"We continue to expect that our revenue growth rates will decelerate sequentially throughout 2019 on a constant currency basis," the CFO noted.