indenti.ca has a Twitter alternative that can be used in conjunction with Twitter, but seems to be designed for more serious information sharing.
Adicus Ryan Garton at Atomjack magazine has been these “dents” (as opposed to tweets) to post his rejections. I know because I have been waiting with bated breath for my reject.
I enjoyed the following rejection notice: rejected: reincarnation (twice!), nazis, twist ending.
I guess that the writer did not heed my No Nazis law on this site.
I like this. I will watch for my notice to come up – It will read: Reject: Robots, nigerian scam, teleogy, numerous typos.
93 days and waiting. Adicus can’t be recording all of them – just the doozies.