Also some of the categories are empty. I looked for IT and Software Jobs in the San Francisco Bay Area, and it has nothing. It might be better to start with a narrower focus and solve the chicken-and-egg problem first. If you have posts, then you'll get readers, and then you'll get more posts.
On the homepage:
* I would limit your popular cities to the top 4 or 5 as some only have 1 or 2 items listed.
* I'd limit the recent activities also, you have some from two days ago.