I'm trying to figure this out for a small business situation. I know the price will vary from situation to situation. I am not looking for an answer that says it depends on this or that... I know there are different factors that affect a price. However, if you could give a ball park average for a business making a few million in sales a year. (I worked at a Chick-fil-A restaurant that makes 3.5 million a year.) A busy fast-food restaurant should fit that description. I'm not talking about companies like Apple or Best Buy.

The best answer would be one that breaks the price down to a monthly cost for each platform. The price could even vary. I.e.
1. How much would it cost for a Facebook fan page? $500 - $1,000
2. How much for a Twitter page? $1,000 - $2,500
3. How much for a blog... and how many posts per a week would that price include? $100 per blog entry
4. How much to have a website optimized for search engines? 1 million a month
5. What else is there and how much does it cost. EzineArticle marketing - $250 per article
...

Thanks for any help you can give me.