It always was a bit implausible - the idea that there was a method of communicating with teenagers. Limited success with dolphins and PVS patients got scientists' hopes up, but ultimately there are limits to all human endeavour.
And a new report from Pew Internet & American Life Project reveals the full extent of this failure.
Back in 2006, 28 percent of teens between 12 and 17 were blogging, often so informatively that their parents knew which continent they were on.
But, says Pew, the effort exhausted them so much that nearly half of them have packed it in and gone back to bed.
Only 18 percent were still blogging last year. Just over half now comment on their friends' blogs, says Pew, compared with more than three-quarters three years ago.
Obviously, though, they still need the kit. Apparently almost 70 percent own a computer. And 73 percent belong to some sort of social network, although they're sending fewer and fewer messages.
Hardly any use Twitter, presumably because 140 characters leaves them with far too much space to fill. High-school age girls are amongst the few that do: after all, "I hate my parents - I didn't ask to be born," is at least easy to spell.
One highly suspect finding was that 62 percent of online teens get news about current events and politics online. Oh, come on. Current events? Politics?