Sounds useful - so long as you're willing to trust FB with any kind of genetic information, don't have any concern for apoe4 allele(s) becoming a 'preexisting condition', and are comfortable with the chances of the Republicans managing to undo that protection in the AHA.
That said, I *am* considering having a test done, primarily so I can use the results with the genetics-matching tool at foundmyfitness.com.