It is often the first taste of social media for the older populace.
"We feel a responsibility to make sure our services aren't just fun to use, but also good for people's well-being", Zuckerberg wrote in a post on his personal Facebook page, adding that he expected "the time people spend on Facebook and some measures of engagement will go down".
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The social network is still growing but will rely on growth in older age groups. eMarketer predicts Facebook's total US growth will be just 1 percent this year, similar to the growth it saw in the USA and Canada in 2017.
Ages 11 and younger will decline by 9.3%.
eMarketer puts this down to Snapchat's "range of interactive features that have appeal to teen audiences". A Washington Post report from a year ago cited that young users found Facebook to be detrimental to their interpersonal relationship.
A 5.6 percent decline in users between 12- and 17-years-old. For 2018, eMarketer predicts the number of total Facebook users in the USA will reach 169.5 million, up nearly one per cent from 2017.
Ages 12-17 will decline by 5.6%.
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A teen interviewed by U.S. today said that he doesn't "think Facebook panders to teenagers as well as it does to older generations". It admitted in 2013 that young people were hanging out on Facebook less frequently.
Fewer teens will be looking at Facebook this year, an eMarketer forecast says.
The social networking giant is not as popular among 12-to-24-year-olds, who are flocking to Snapchat to escape their parents and grandparents.
However, Instagram overall is still bigger in the U.S. than Snapchat. Also important is the relative anonymity it offers compared to Facebook.
Snapchat's success may spread beyond teens soon, too. Facebook is still growing, but it is older generations who are adding these numbers; commercially this is not as attractive.
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Experts, and Facebook itself, have long warned that the platform could struggle to engage and retain young users as other social media alternatives emerged. Older users, with more money to spend, would help infuse Snap with much-needed revenue to continue its growth and innovation.