It looks like something may have gone wrong with your RSS puller. I do see where there were a bunch of duplicate posts to twitter because of the different TinyURL, each one is to also to a different post on your site (which is why the TinyURL changed).
For instance, these three tweets:
Get the Samsung Fascinate for a penny!: http://tinyurl.com/2uw247k 1:10 AM Sep 28th via leenk.me
Get the Samsung Fascinate for a penny!: http://tinyurl.com/3237zn9 1:10 AM Sep 28th via leenk.me
Get the Samsung Fascinate for a penny!: http://tinyurl.com/3839fp2 1:10 AM Sep 28th via leenk.me
Go to these three posts (respectively):
Which tells me that the post "Get The Samsung Fascinate for a Penny" attempted to be published several times on your site. Do you have a lot of invalid posts on your blog (or posted that are labeled as "missed schedule"? Leenk.me definitely doesn't create new content, it is only triggered when a new post is published.
What are you using to pull in RSS content? I'd like to test this out to see if I can replicate the issue.
Thanks again and sorry you had such a bad experience.