It seems that WP-United is interfering with Jetpack's promotion/sharing feature. I try to connect my site to Twitter, Facebook, etc and get the following error from Jetpack:
Something which should never happen, happened. Sorry about that. If you try again, maybe it will work. Error code: -32300
This happens when the WP-United plugin is enabled. I also noticed I can't connect this particular blog with any other blogs that use jetpack. So it doesn't seem to allow Jetpack to communicate with external sites.
Any fix to this? Thanks!