Co-founder Will Kern wrote us today to explain how the site started and how it works. "The product launched with just the ability to list and tweet items for sale, but I quickly followed that up with the ability for recruiters and employers to post and tweet jobs," he said.

"I quickly recognized a huge potential in aggregating items being tweeted for sale on Twitter and jobs being posted on Twitter. I quickly followed that up with a release that pinged the Twitter search API and aggregated all items listed for sale and jobs being posted."

Kern also told us that the most recent releases of the app included OAuth support and the addition of "on sale" tweets.

In concept, the site is similar to iList Micro, a Twitter-oriented subdomain of iList that launched earlier this year.

Although listings can be spam-heavy in highly competitive areas such as real estate or content-light for categories such as art or event tickets, one can imagine that as Tweetmart's search of Twitter's unwitting classifieds improves, so will the site's content and usefulness.