With a full-blown Wordpress blog, in addition to our Facebook Fan Page and Twitter account, you might be wondering why in the world I’d want another site to maintain. The simple answer: the more I use Posterous, the more I love it! — Especially for the particular niche it serves. (more on that after the jump)

I like to think of Posterous as a miniblog– something that gives you greater freedom of expression than Twitter’s 140 characters (known as microblogging), but often is shorter and more sketchy than a fully fleshed out Wordpress post. One of my favorite Posterous features is autoposting, which allows you to link any content you send to Posterous with sites like your Facebook page or Twitter stream. The autopost feature currently supports Facebook, Twitter, Flickr, Picasa, YouTube, Vimeo, Tumblr, Blogger, Wordpress and Xanga, with more integrations on the way.

For MailChimp, I’ve made the decision to only link Posterous to our Facebook Fan Page. So when I’m finding and adding content, our Facebook Fans are the audience that I generally have in mind.

So you might be wondering: but MailChimp, now that you have over 3,500 Facebook fans, how do you make sure your content is relevant to everyone?

The candid answer is that I don’t. I have to assume that if someone becomes a MailChimp fan, they’re interested in what we have to say. Much like email marketing, becoming a fan is a way of opting-in. In the case of Facebook, this means that someone is electing to receive updates from MailChimp in their home feed. (Side Note: Facebook does give you the option of hiding updates from a particular person or page if you find the number of updates annoying or excessive.)

As far as the content is concerned, often times I’ll post information and photos about what’s going on in our office (chimps are people too, you know!), links to interesting articles about design, small business and entrepreneurship, and even the occasional funny monkey photo.

Two things that have worked well for driving engagement on Facebook (measured in terms of “likes” and comments) by way of Posterous have been 1) making sure to maintain variety in the type of links and content posted, and 2) not treating the Posterous to Facebook autopost feature as “set it and forget it.” How can you expect people to engage with your business or brand– on Facebook, Twitter or your blog– if you don’t maintain an active presence there? I’ve made a habit of consistently responding to what our fans and followers have to say and have noticed a measurable correlation in their level of engagement thanks to Facebook Page Insights. So after posting something to Posterous and properly tagging it (I like to keep things categorized and organized), I head over to Facebook to see what, if anything, our fans are saying about it.

A fan page is it’s own little ecosystem, and it needs to be nurtured and treated that way. This becomes even more important if you’re feeding content into it from auxiliary sources.

To begin, you need to make sure that you have two things: 1. a Facebook fan page, and 2. the HTML code from MailChimp that allows you to embed your sign-up form on a web page.

Step 1. Grab your MailChimp list’s embed code

In your MailChimp Dashboard, click on the Lists tab. Then click on “forms” for the list that you want the subscribes to go to.

Then you’ll select “integration code” from the top menu, which will present you with a link to the Signup Form Embed Code. From here, you’ll simply want to copy the embed code and paste it into TextEdit or NotePad.

Step 2. Add the Static FBML Application

FBML stands for Facebook Markup Language. At its core, FBML allows you to embed your application in the Facebook platform. It isn’t quite HTML, but it isn’t quite proprietary either. (Jesse Farmer provides a great introduction to FBML if you’re interested in reading more.) The easiest way to add the application is to search for “Static FBML” using the upper right hand search box on Facebook. It’ll show up as the second search result, and you need to click on “add to page”.

Step 3. Create the Newsletter Signup Tab

Navigate back over to your fan page and select “edit page” from right below your profile picture.

Scroll down to find FBML in your list of applications, and click on the little pencil icon to edit it.

In “Box Title” you can give the tab a name like “Email Signup” or “Newsletter”. Then in the “FBML” section, you’ll paste in the embed code that you copied from MailChimp in Step 1. It’s easy to style your form using basic HTML to give it a look and feel that matches your brand. One suggestion that Return on Subscriber makes (and we agree with wholeheartedly) is adding the following customization:

<form method=”post” action=”http://url.com” TARGET=”_blank”>

at the end of the url to open a new browser tab or window. This is nice thing to do for your user so they can easily find their way back to the page they were originally browsing.

Step 4. Add a New Tab to Your Fan Page Top Navigation Bar

Go back to your fan page and select “edit page” from directly below your profile picture. Then scroll down to find FBML in your list of applications, and click on the little pencil icon to edit it once again. This time you want to select “Application Settings”.

From the Application Settings, you’ll have the option to select whether you want your signup form to appear as a box (in the manner of Fans, Notes, or Favorite Pages), a top navigation tab, or both. As you can see on the MailChimp Fan Page, we have our signup form set up as both a box and a tab. This is a matter of individual preference and will not affect the functionality of the form.

And that’s it! If you have questions, thoughts or suggestions on innovative ways to use this, please leave a comment and let us know!