A smart way to encourage users to send diagnostics
Personally, I'd be more willing to share diagnostics if it's possible to preview them before sending. This is especially true for FOSS since it has a large user space interested in privacy.
Fritter Twitter frontend app for Android:
This approach is nice indeed, but have you tried to read through, let's say, Apple's error reports? People don't usually like to go over the 10000 lines of a stacktrace and end up not sending them :)
Maybe not everyone will read through them, but someone will, so having the option isn't going to hurt anyone.