Bug 1233908 is working on making decisions about the "share this page" functionality however it would be nice to know how often this code path gets used. The feed reader also is something we are interested in how often gets used. Both are related as the share functionality eventually then calls the preview page. I would like to work out how often people are seeing the preview over seeing other code paths such as visiting web handlers.

Sorry I was referring to the subscribe button that uses preview. Share this page uses the social services. Both buttons would be worth checking on their usage.

The "Share this page" stuff is now dead, but the feed stuff isn't. Going to put everything in 1 bug to make it easier to track, so duping to bug 1350349.