http://www.nytimes.com/2008/11/12/technology/internet/12flu.html?_r=2&oref=login&oref=slogin&oref=slogin
The tracker: http://www.google.org/flutrends/
Ferengi Rule of Acquisition #34: War is good for business. | Anticorollary: War is bad for public health. Ferengi Rule of Acquisition #35: Peace is good for business. | Corollary: Peace is good for public health.
[Copying and pasting from the above link:]
PubSearch
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PubSearch v1.3 saves the current search results when exiting the app.
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it shows what journals other people are reading ... like if they're reading the same ones, and i think it keeps track of your references, and i think it, like, "bibliographizes" stuff for you, like puts it in APA format.
I provide the content and funding + You (whoever you are) provide the programming and tech support = We enhance and save lives.

Got an assignment today to "research on technolgy [sic] and reaching youth with health messages." Might as well document it for myself and everyone else.
everything you need to know
Stanford professor Dr. BJ Fogg organized a conference (texting4health.org -- the name says it all) earlier this year addressing mobile-technology for health. He states, "Mobile phones will become the #1 platform for persuasion." Looks like the conference was done in partnership with, amongst others, the American Heart Association and ISIS.
This is excellent, it's not youth specific, but if you combine the info presented here with the pew internet research (where the above charts came from), i think it adds up to something that makes sense. and much, much more useful, telling data.
other stuff i found
case study
youth and electronic communication (section 4)
not youth oriented, but this gives you an idea of different ways to interact with and present info to the youth via texting service.