There are hundreds of millions of people passing through this site each month (with many of them coming from syndicated outlets like AOL, Yahoo, Trulia and more) and most of them are there with the sole purpose of looking for real estate to buy and rent. It's also worth noting that many buyers start their search with Zillow (instead of looking only at their local MLS listings), so it's a great way to gain exposure to a massive (and targeted) audience at no cost.
Hotpads is a unique one on this list, because it's only intended for listing properties (houses, apartments, condos, etc) for rent, not for sale. Nevertheless, this still fills a major need for many property owners, and since it's one of the bigger players in the space, with a very well-designed layout and interface, it's definitely worth mentioning on this list.
Contact the owners of surrounding parcels of land to determine if they want to buy it. Sometimes, a land owner will want to increase the size of her holdings. If your land has access to a road, water or another valuable feature, it can be particularly valuable to a neighbor whose land doesn't have that attribute. Your neighbors are also familiar with your land, the area and its prospects, so they should be able to decide more quickly than someone who comes into the area cold.
First impressions are lasting in real estate. When selling a home you would never leave out your dirty laundry for potential buyers to see, and you should also clean up your lot before it is shown and marketed. Cut the grass (or weeds), remove trash and take marketing photos of your property when it is looking its best. Some sellers even plant wildflowers to make their vacant land look beautiful. It’s like staging a home, but you’re just working with raw land instead.