1. Set up a Facebook fan page. While it's fairly obvious, there are certainly a few DJs out there that haven't done this all important step yet. When you have made a fan page, join all of the DJ themed Facebook groups you can find, then start posting comments and url to your DJ mix downloads available. Inquire into other people's posts, distribute pictures, announce upcoming gigs... every little bit helps!
2. Try Soundcloud for delivering free mix downloads available. Soundcloud. com is great for many reasons, but eat is their system for managing music files. They provide widgets that you can use throughout sites, basic promotion tools, download statistics and more. If you haven't already enrolled, you must. If you already have a user account, Buy SoundCloud Reposts be sure to post your content regularly!
3. Promotion isn't all about online tools. Having decent DJ business cards is still a must. Pass them out at gigs or when you're checking out other DJs -- having a decent business card promoting your skills is a necessity. Don't forget all of the pertinent details like your Facebook and Soundcloud Urls. Providing several methods of reaching you is key as you can't predict when someone will get around to it. The fact is, phones and email are not always the first point of contact, so make sure to list several options.
4. Design a cool DJ logo. There are many methods for getting a good logo designed, from making trades with graphic designers which come to your gigs, hiring a professional or using free online tools. Whatever option you choose, make sure to place your logo on your ZYNGA page, website, biz card, flyers, CD cases, etc. Consistency is the key to being professional and that is what you want everyone to consentrate... that you're an expert DJ who deserves to be taken seriously.
5. Promotional Cd albums and downloads available of your mix sets. This is a "last but not least" item as it ought to be obvious, but is always worth remembering. Consistently release new promotional mixes (either monthly in order to promote future gigs). If you like to give out physical Cd albums, place a business card in the paper sleeve. But be sure to have digital versions available for free download as many folks don't like hassling with Cd albums anymore.