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 :)