** EDIT **
Check out jonperls answer. He has compiled a working version of famo.us for use in JSFiddle. Simply use the External Links feature of JSFiddle to link to the compiled source.
** ORIGINAL **
I have not heard of any way to share snippets in line with working examples.. But you could always just host the code here.. then link to the working example.
The quickest and easiest way I found to share Famo.us demos has been to host the examples on amazon's S3 as a static webpage.
It is super easy to create a bucket and enable it to act as a static hosted site.
Worrying about DNS is optional. When you enable a bucket as a static host you get an endpoint. eg.
http://higherorderhuman.com.s3-website-us-east-1.amazonaws.com
It is up to you if you want to deal with setting up DNS and making that point to a more attractive URL. For me, both..
http://higherorderhuman.com.s3-website-us-east-1.amazonaws.com/examples/lens.html
and
http://higherorderhuman.com/examples/lens.html
Go to the same place.
By using folders on s3 and creating separate html files, I am able to host all examples from this single endpoind. eg. another example at..
http://higherorderhuman.com/examples/scrollbars.html
Just make sure all files that get uploaded are made public with.. 'Make Public'
Still looking forward for JSFiddle support.. But at least this does it for me for now!