I came across this great article this afternoon - I think it gives a nice simple explanation of the methods you can use to promote your business to potential customers for free. Here's an excerpt...
Here are four ways you can build trust online:
1. Blog. This is the absolute starting point for your content strategy because it makes content production, syndication, and sharing so easy. The search engines love blog content as well, and this is the place where you can organize a great deal of your editorial thinking. This can easily be expanded and adapted to become content for articles, workshops, and ebooks.
2. Social media. You need to claim all the free opportunities to create social media profiles on sites like LinkedIn and Facebook, but also in the online communities for such magazines as BusinessWeek, Entrepreneur, and Inc. Building rich profiles and optimizing links, images, and videos that point back to your main site is an important part of the content-as-strategy play.
3. Reviews. Ratings and reviews sites such as Yelp, MerchantCircle, and CitySearch have become mainstream, user-generated content hubs. Throw in the fact that Google, Yahoo, and Bing all allow folks to rate and review businesses, and you’ve got an increasingly important category of content that you must participate in.
4. Customer testimonials. These are a powerful form of content. Every business today should seek customer testimonials in multiple forms: written, audio, and video. This content adds important trust-building endorsements and makes for great brand-building assets out there on Google and YouTube.
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Check out the full article here, it's well worth a read!
http://www.entrepreneur.com/article/242289