市場研究公司eMarketer在周一表示，F(xiàn)acebook 12至17歲月活躍用戶流失今年將加速到3.4%,，2016年為1.2%,。另外，12歲以下和18至24歲用戶的增長速度,，今年也將分別下降3.1%和14.5%,。

年輕用戶群體的預期下滑（或增長速度放緩）將對Facebook構(gòu)成挑戰(zhàn)，因為其正在努力留住年輕用戶,，以便繼續(xù)吸引廣告商。最近一個季度,，F(xiàn)acebook公布的廣告收入接近92億美元,，比去年同期增長了47%。

但Facebook遭遇的年輕用戶問題,，可能令其照片服務Instagram和社交媒體競爭對手Snapchat從中受益,。eMarketer表示，今年,，Snapchat 12至17歲和18至24歲用戶群體的增長速度,，首次超越了Facebook和Instagram，另外,，Snapchat在美國社交網(wǎng)絡用戶中所占的比例將從去年的31.6%增長到40.8%,。

Facebook的美國總月度活躍用戶今年將增長2.4%，達到1.729億,，表明其服務遠沒有到絕望的地步,。eMarketer的報告將Facebook總體用戶增長的原因歸功于“年齡較大網(wǎng)民群體的采用率提高”,。

eMarketer還給Facebook旗下的Instagram帶來了好消息。其預測,，Instagram今年的美國月度活躍用戶增長率將達到23.8%,。預計其12歲以下月活躍用戶將增長19%，12至17歲用戶群體將增長8.8%,。

eMarketer首席分析師黛布拉·阿霍·威廉森在一份聲明中表示：“Facebook很幸運擁有Instagram,，它依舊是深受青少年歡迎的社交平臺?！保ㄘ敻恢形木W(wǎng)）

譯者：劉進龍/汪皓

Facebook's loss of monthly users between the ages of 12 and 17 will accelerate to 3.4% this year compared to a 1.2% drop in 2016, research firm eMarketer said on Monday. Meanwhile, growth in users under the age of 12 and between 18 and 24 will slow 3.1% and 14.5%, respectively, for the year.

The predicted decline (or slower growth) among younger age groups is a problem for Facebook as it tries to retain younger users to remain an attractive destination for advertisers. In the most recent quarter, Facebook reported nearly $9.2 billion in ad revenue, up 47% from the same period last year.

But Facebook's struggles with younger users are gains for its subsidiary, the photo-centric service Instagram, as well as for social media rival Snapchat. For the first time, Snapchat will overtake Facebook and Instagram among the 12-to-17 and 18-to-24 age groups in terms of U.S. users this year, eMarketer said, while Snapchat's share of U.S. social networks users will grow to 40.8%, up from 31.6% last year.

Overall, Facebook's total monthly users are expected to increase 2.4% this year, to 172.9 million in the U.S., signaling that the service is far from hopeless. The eMarketer report attributes Facebook's overall user uptick to "increased adoption by older internet users."

EMarketer has better news for Facebook-owned Instagram, which is expected to post growth in monthly U.S. users of 23.8% this year. Monthly Instagram users under 12 years old are expected to increase 19%, with the 12-to-17 group growing 8.8%.

"Facebook is fortunate that it owns Instagram, which remains a strong platform for teens," eMarketer principal analyst Debra Aho Williamson said in a statement.