Pfui - 3:57 pm on Feb 27, 2012 (gmt 0)
The majority of the bots in the OP are from amazonaws.com IPs, a notorious home base for Twitter swarmers. [webmasterworld.com...]
Unfortunately, they're not one-hit wonders. Long after the original tweet(s), most of the AWS-cloaked bots hit day in and day out, HEADs and GETs, good URLs and bad, 200s or 403s, ad nauseam.
In the case of re-re-re-tweets, the bots' brain-dead re-re-re-swarming is almost more comical than wasteful. Almost.