So the bottom line is, Facebook is the old people network while Snapchat is for the young and trendy.
For 2018, the company will post its first-ever decline in the 18-24 age group, with the reporting putting the fall at 5.8 percent.
There could be many reasons for Facebook's decline in popularity amongst the younger generation, part of it may be that Facebook is no longer seen as the "cool" social media platform. While Facebook still stands well ahead of Instagram, Snapchat and Twitter in terms of overall user numbers, the drop among younger age groups suggests that its rivals are taking some of the share. Of the 2 million US users under 25 that eMarketer estimates Facebook will drop this year, it sees Instagram catching only 1.6 million, while Snapchat is likely to scoop up 1.9 million. The study says the declining trend in users under 25 is expected to continue into 2019 and 2020.
In the United Kingdom, 71% of social network users between 12 and 17 years old will be using Facebook regularly this year, a downgrade of eight points from last year's forecast, EMarketer said. At the same time, Snapchat and Instagram will add users from that age group. "That's the predicament Facebook is in", the report noted.
Instagram is still bigger in the USA than Snapchat.
The age group younger than 25 years old is typically considered Gen Z, while the cohort directly older are millennials.
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Facebook has known about their "teen-trouble" for a while and has worked hard to keep current by continuously offering new products and platforms that might appeal to younger users. A Facebook spokesperson declined to comment on the firm's latest report. But now, they are flocking to Snapchat, and the ephemeral photo-sharing app's recent redesign is expected to accelerate this exodus.
However, Instagram still has more users in the U.S. than Snapchat, with their number expected to grow by 13.1% this year to reach 104.7 million.
Overall, eMarketer found Facebook lost about 2.8 million U.S. users under 25 previous year.
Zuckerberg has pledged to spend this year "making sure that time spent on Facebook is time well spent".
Snapchat will rack up 86.5 million users, this year - an increase of 9.3% compared to 2017.
While its domestic growth will slow to below 1%, Facebook is still on track to lead the pack in 2018 with 169.5 million domestic users.