Source: Snapchat

How can social-media upstart Snapchat, with scant revenues and ongoing net losses, be worth more than twice microblogging platform Twitter (TWTR)?

The vanishing-video and photo app is reportedly wrapping up a new round of financing that pegs Snapchat at a cool $20 billion, compared with the $9.8 billion market capitalization Twitter currently sports.

Let's quickly examine what led to this social-media changing of the guard.

Snapchat's $20 billion valuation 

According to a number of media outlets, Snapchat is quickly finishing a fresh round of financing that pegs the four-year-old company   at a valuation of $20 billion.

This fundraising round is technically a follow-on to Snapchat's February Series-F financing, which pegged the company at a $16 billion valuation. However, an analysis from private-funding analyst group VC Experts notes that financing could expand Snapchat's valuation to over $20 billion, should all the shares authorized as part of the fundraising actually become issued. TechCrunch and other outlets are reporting that this follow-on offering indeed pushes Snapchat's valuation to $20 billion.

If so, this new valuation makes Snapchat the fifth most valuable privately held unicorn -- a start-up valued in excess of $1 billion -- behind other well-known names such as Uber, Xiaomi, AirBnb, and Chinese ride-hailing app and recent Apple investment Didi Chuxing.

So now that we understand the specifics of Snapchat's $20 billion valuation, let's see why it sits at more than double that of Twitter.

Why is Snapchat worth more than Twitter? 

The disparity in valuations between Snapchat and Twitter speak as much to Snapchat's seeming overnight success as to Twitter's post-IPO struggles.

TWTR Chart

TWTR data by YCharts

Twitter's stock has been decimated over the past year, thanks to a raft of issues ranging from slowing growth to management hirings and firings. Internal issues at Twitter aside, what about the fundamentals underpinning these valuations? What supports them?

Much of the valuation attached to tech companies whose business models are still evolving is based on growth. Tech investors and venture capitalists love companies that are expanding rapidly.  And when it comes to growth, Snapchat trounces Twitter, even though Twitter's revenues easily exceed Snapchat's and Twitter is expected to reach consistent profitability this year.

The average analyst estimate calls for Twitter's sales to grow 23% and 21%  in the next two years, with revenues totaling $2.7 billion and $3.3 billion . Few companies are ever fortunate enough to surpass $1 billion in sales, so Twitter's accomplishments shouldn't be ignored as much as they seem to be. However, with Twitter's user growth having flatlined in recent quarters, its valuation will probably remain constrained as long as investors see no path for it to address an appreciably larger market, profits notwithstanding. This, incidentally, is also why I so strongly advocate that newly reappointed CEO Jack Dorsey needs to innovate more aggressively on the product front.

Source: Snapchat

Conversely, though it lags Twitter's financial size today, Snapchat is growing like a weed, giving investors hope that it will become the next Facebook or Alphabet, the next hundred-billion-dollar platform. According to reports, the vanishing-video app has seen its engagement stats explode from a reported 7 billion daily video views at the start of the year  to in excess of 10 billion at the end of last month. As it turns an increasing eye toward monetization, Snapchat is reportedly targeting between $300 million and $350 million in sales this year, up nearly sixfold from last year.

Investors, it seems, are betting that Snapchat will indeed become the next major force in online media, whereas Twitter's prospects of securing a similarly vaunted position are far less certain thanks to its recent slowdown. So while this line of thinking isn't necessarily based on the same fundamental analysis value investors use to shape their investment decisions, it helps explain why Snapchat is worth more than Twitter.