This mirrors other recent findings, such as those by U.S.investment bank Piper Jaffray, which conducted its semi-annual "Taking Stock With Teens" project back in October.
It found that Twitter was fast becoming the most important social media network among younger users, and was "eclipsing Facebook, followed closely by Instagram." Thepopularity of Facebook was waning among teens, the bank said, with 23 percent citing it as the most important, down from 33 percent six months ago and 42 percent a year ago.
Indeed, in her August op-ed on news site Mashable, Karp wrote: "Part of the reason Facebook is losing my generation's attention is the fact that there are other networks now. When I was 10, I wasn't old enough to have a Facebook. But a magical thing called Instagram had just come out."
Professor Daniel Miller, who is working on University College London's Social Networking Sites and Social Science Research Project, found a similar trend.
He wrote that among a small survey of 16 to 18 year olds,"Facebook is not just falling, it is basically dead, finished, kaput, over," and that many users will only stay on the website as a "mode of family interaction because their parents and even grandparents are starting to see it as almost an obligation to keep in touch through Facebook."
Still, Gregory Galant, the CEO of Muck Rack told CNBC in October: "I think Facebook's going to be around for a very long time, not because their current product can last the test of time but because they're unusually adept at evolving."
Indeed, the Pew Survey stressed that Facebook is still the platform that engages its users the best.
"In addition to being the most commonly used social networking platform of the five we measured, Facebook also has high levels of engagement among its users," the report noted. "63 percent of Facebook users visit the site at least once a day, with 40 percent doing so multiple times throughout the day."