Something to add about where Facebook's spectacular growth is coming from. Facebook's business model is to let customers (advertisers) offer a bid for any or these three things - Impressions (views), clicks on ads and conversions (actions taken like checking out an item). When one of these happens, they have to pay an amount bidded by them. The higher your bid, the greater the intensity of these events will happen because Facebook will prioritize your ad, but Facebook will still let lower bids get some action. So on the ground, Facebook's revenue grows when these things either happens at a greater rate, or customers pay more for these things to happen.
The first would increase with more users, users spending more time on the platform, and increasing the ad load (the amount of ads on the user's page). In the past years, growth has been driven by all three. Facebook does not release data on how much time users spend on it, but it has noted that 87% of revenue comes from mobile. In fact, almost all growth since 2012 has been from mobile. Facebook has recently stated that it cannot increase the ad load without harming the user experience, and looking at my own Facebook I agree that any more ads would be very annoying. From 2014-2017, Facebook's active monthly users grew at 15% CGAR. Recently this growth has started slowing. Facebook's monetization of users has been growing even faster. In 2014 Q4, revenue per user was $2.81. In 2017 Q4, it was $6.18. This is an annual CGAR of 30%. How this happens seem to be mostly the result of the growth in Facebook mobile users, and some due to increased ad load (I'm basing this on the fact that the ad load on my Facebook have not grown exponentially while mobile usage has at a CGAR of 50.2%, and that the revenue from desktop Facebook has been flat since 2012). The growth in users and revenue per user has together at 45% led the increase in Facebook's revenue for the past years, between 36% - 52%.
So where has Facebook's growth got to go from here? Facebook's active users at 2.27 billion as of the recent quarter. Interestingly, Facebook's active user growth for the past decade is linear, with users growing remarkably close to 210 million year on year every year. The mathematical effect of this is that user growth as a percentage declines every year. If this trend continues next year it will grow by 9%, then 8.5%, then 7.8% and so on. And what about mobile? From 2009 Q4 to 2016 Q4 (FB has since stopped publishing mobile active users), it went from 101 million to 1.74 billion, a CGAR of 50.2%. Just 30% more of that would be 2.26 billion, so mobile growth cannot continue above the rate of user growth. Going forward, it seems Facebook's revenue per user will flatten out. If we assign it say 7%, Facebook would grow at between 16% and slowly dropping in the coming years.
But there's a very big caveat here, which is the bidding process. Revenue may not not directly dependent to user growth and user time spent. If the value of Facebook's advertising per click, conversion or view is higher than the price currently being paid by advertisers, this means the current ad prices are depressed because of the ample user actions on Facebook. If the increase in user growth slows and actions per user (ie revenue per user) flattens out, this would squeeze the ad market and increase the price of ads. Advertisers would still pay if it's less than the value they receive. This means I'm looking at this the wrong way. Advertisers would pay Facebook based on how much value they get, now how many users are on it or how much time they spend. From an advertiser's perspective, the increase in user and user time on Facebook serves to drive down the cost of advertising as user actions are more plentiful. But when this stops growing, the price of ads will begin to reflect not how many users they reach but how much it is worth to them.
So possibly to really estimate Facebook's value and future growth, you have to look at how much value each user action has. If Facebook would be compared to a conventional business, each user is an unpaid worker who can leave any time he chooses, and the goods they produce are user actions. Their goods have been sold on a perfectly free bidding market. With their output flattening, perhaps the price of the goods will increase - it depends entirely on the demand of the buyers.
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