If you use an email marketing service, you probably include "forward this email to a friend" links in your messages. They come standard from all the email marketing services.
But wouldn't you like customers and prospects to tell their friends about your blog or website too?
If you're looking for one of the best social media marketing tools around, "Tell-a-Friend" forms are the way to go. The one caveat is, you need to be careful which one you use because they have to potential to be easily spammed. But you can't beat this strategy for its pure word-of-mouth marketing benefits in any case.
Here are three "Tell a Friend" services I've heard good things about. (I haven't used any of these so I can't suggest one over another but you might give one or more a try):
On my camp's website I have an opt-in email form on every page. In addition to the other 67 million things I need to do this week, I'm gonna put a "Tell a Friend" form on each page, too.
If you decide to do this too (and I hope you do!), something important to remember is people won't share or forward ANYTHING unless you give them a good reason to. If you give them a good reason, they'll tell others about your website or blog. Offering a free eBook or t-shirt or discount coupon could be just the ticket to get your blog posts and web pages sailing across the internet.