The second tweet that comes up for me (Providence, RI) is one labeled "North America and Europe." I think local listings should be prioritized over broad ones.
Filters based on language/expertise. I see a lot of these tweets go into specifics already so this could probably be implemented easily.
As someone else mentioned, a link to the tweet would be good, and preservation of the hyperlinks in them so I can click directly on someone's job listing etc.
Perhaps you could also normalize the format of the locations, and group them under one heading. For example, most of the listings for Providence are Boston, and it's a list that looks like, "Boston", "Boston, MA", "Boston", "Boston", "Boston, MA", etc. A consistent format would be good for readability and having a new for each tweet is redundant.
Basically, you have a good crawler (I assume you're using one) and now you need to alter the design of your page to make it easy to explore.