The cost for Facebook to add one additional user is difficult to estimate accurately because it depends on a variety of factors such as marketing expenses, server costs, and personnel expenses. However, we can estimate the cost by looking at Facebook's financial statements and calculating the company's average revenue per user (ARPU) and its operating expenses. As of 2021, Facebook's global ARPU was $9.51. This means that on average, Facebook earns $9.51 for each of its users. Facebook's operating expenses for 2020 were $46.71 billion. Dividing this number by the number of Facebook's monthly active users (2.8 billion as of the second quarter of 2021) gives us an operating expense per user of $16.68. Using these numbers, we can estimate that it costs Facebook approximately $7.17 to add one additional user ($16.68 - $9.51 = $7.17). However, it is important to note that this is a rough estimate and that the actual cost may vary depending on a variety of factors.
Estimation