Facebook's (FB) U.S. PC usage decline isn't just because of mobile, says Evercore's Ken Sena:...

|About: Facebook (FB)|By:, SA News Editor

Facebook's (FB) U.S. PC usage decline isn't just because of mobile, says Evercore's Ken Sena: it's also because younger users are spending less time on the service. comScore (previous) estimates U.S. PC Facebook activity fell 42% and 25% Y/Y in August, respectively, among the 12-17 and 18-24 age groups. Others have pointed out Twitter's relative anonymity and multiple account support is making it more popular with some teenagers.