Word of mouth makes the best salesperson, according to all the sales manuals. Are you ready to take advantage of electronic word of mouth? That's what I believe social media has become, at least for smart businesses. True, most of the "blogosphere" and Twitter-verse may be electronic gossip, but some companies have made huge advances taking word of mouth to the Web.

My expert guide to social media for this column is Sean Percival. He has made a spectacular personal jump over the past 10 years thanks to social media, and he wants to help your company make a similar jump. How big a jump? A decade ago Percival was a janitor cleaning the offices at Vegas.com, and decided he wanted to work with people having fun on this new World Wide Web thingy rather than clean up after them. Now he's a social media expert, online commerce business person, Web developer, and author (his second book, MySpace Marketing, is coming out soon).

Percival loves helping small companies succeed, and he has a pretty simple plan: give away lots of information about your niche, build credibility, and experiment with Internet advertising with a budget of $100 per month.

“First of all, find out what people are talking about,” says Percival. “If you're not into social media yet, search for terms about your business or expertise on search engines. Get on Twitter, join groups about your area, and answer questions.”

Many small business people still don't believe in social media -- the bloggers and Twitter users glued to their keyboards at the expense of a real life. That unfortunate stereotype will hang around for a few more years, no doubt, but the difference is that Main Street now cares what bloggers and tweeters say. At least they care when they search, since putting information out on various social media outlets makes that information pop up in Google searches, and Main Street cares a lot about searching now.

“Go to Google Blog Search and see what's out there about your area of expertise,” says Percival. “If you see questions from people asking how to do something, and you know the answer, give it.” You can also check out Technorati, probably the biggest blog search site.

In a talk I give at conferences called “Resonate with your customers like Girl Scout Cookies” I advise companies to have a blog, but not to let the head of sales near it. Let the tech support manager write the blog, and fill it with tricks on how to help people use your products or services better. Talk about preventative maintenance, ways to extend the life of the products, and interesting ways other customers are using the products. When someone looking for your product searches Google or Yahoo, those blog posts will appear.