Every investor should have an investing thesis for why they bought a stock. Here's mine for Pinterest(NYSE:PINS), which I bought for the first time earlier this year.

Social networking, e-commerce, and digital advertising are all long-established trends, and Pinterest stands to benefit from all of them. Pinterest users gravitate toward the platform because it's more inspirational and apolitical than others, and I expect the company still has plenty of room to grow its user base from here. Plus, by rolling out new monetization features, I believe Pinterest can rapidly grow its revenue and become a multibagger stock over the next decade.

That's my bullish thesis, and recent developments confirm it. Here are three reasons to buy Pinterest stock.

Pinterest defines monthly active users (MAU) as people accessing or interacting with the platform at least once in a calendar month. In the second quarter of 2020, Pinterest grew MAU both internationally and domestically. Globally, MAU surged 39% year over year to 416 million.

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