Pinterest shares (NYSE: PINS) are skyrocketing in premarket trading this morning after the company announced Q4 results for its fiscal 2024 yesterday. PINS stock is currently up over 22% to above $41 per share as of the time of this writing. It hasnt seen that price point seen since last July. Heres what you need to know about Pinterests latest results and its surging stock.Pinterests revenue and growing user base shine in Q4Almost any way you look at it, Pinterest had a great Q4, with two metrics really seeming to have made investors happy:Revenue: $1.15 billionGlobal Monthly Active Users (MAUs): 553 millionFor its fourth quarter, Pinterest generated revenue of $1.15 billion. Not only did that exceed analyst estimates of $1.14 billion for the quarter (per CNBC), but its the first time that Pinterest has generated over $1 billion in revenue in a single quarter. It also represents a growth of 18% versus the quarter a year earlier.Pinterests first billion-dollar quarter also helped lift the companys total revenue for its entire fiscal 2024. The company reported that it brought in total revenue of $3.6 billion during its 2024 financial yeargrowth of 19% over fiscal 2023.But it wasnt just revenue that has pleased investors. Pinterest also saw its global monthly active user base (MAU) grow by double digits in the quarter. The company ended Q4 2024 with 553 million monthly active users. Thats 11% more than the quarter a year earlier and an all-time high for the social media company.Pinterest, like other smaller social media networks, has faced ad pressures in recent years as advertisers wrestle with where to spend their moneywith most opting to do so on Metas and Googles platforms where engagement and user bases are larger. But not only has Pinterests Q4 results suggested the company is growing its ad revenues, its user base growth also bodes well for the company in attracting more advertisers in the future.Announcing the companys Q4 results, Pinterest CEO Bill Ready said, 2024 was a banner year for Pinterest, capped off by a milestone Q4achieving the companys first billion-dollar revenue quarter and a record 553 million monthly active users, as we continue to drive profitable growth and free cash flow.Looking ahead to 2025Pinterest is currently in its first quarter of fiscal 2025. On yesterdays earnings call, the company offered revenue guidance for the period, saying it expects revenue to come in between $837 million and $852 million, a year-over-year growth of between 13% and 15%. As MarketWatch noted, that is above the FactSet consensus, which was only $836 million.As of yesterdays close, before its Q4 results boost, PINS shares ended the day at $33.59. That equates to a year-to-date return of nearly 16%. However, over the past year, the stock price has fallen over 18%. Todays premarket boost, if it holds up once the markets open, can help erase much of those losses.Our strategy is paying off. People are coming to Pinterest more often, the platform has never been more actionable, and our lower funnel focus is driving results for users and advertisers, Ready said. Looking ahead, Im confident that our focus on being a positive platform is a competitive advantage in driving long-term success for the business and value for our advertisers and users.