www.infineca.com/blog/how-to-explain-social-media-roi-with-google-analytics
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Accounting for Customers Acquired Online
The customer acquisition cost (CAC) refers to the marketing, advertising, support, and other types of expenses required to convert a prospect into a customer. CAC usually excludes the cost of a sales force (the salary and commissions) or payments to affiliates. Some companies carefully segregate promotional expenses, such as loyalty programs, that relate to branding or customer retention. As long as you apply your definition consistently, you’re okay.
If your goal in social media marketing is branding or improving relationships with existing customers, CAC may be a bit misleading, but it’s still worth tracking for comparison purposes.
The definition of your customers and the cost of acquiring them depend on the nature of your business. For example, if you have a purely advertising-supported, web-only business, visitors to your site may not even purchase anything. They simply show up, or perhaps they register to download some information online. Your real customers are advertisers. However, a similar business that’s not supported by advertising may need to treat those same registrants as leads who might later purchase services or pay for subscriptions.
Comparing the costs of customer acquisition
You may want to delineate CAC for several different revenue streams or marketing channels: consumers versus businesses; products versus services (for example, software and support contracts); online sales versus offline sales; and consumers versus advertisers. Compare each one against the average CAC for your company overall. The formula is simple:
customer acquisition cost = marketing cost ÷ number of leads
Be careful! This formula can be misleading if you calculate it over too short a time frame. The CAC may be too high during quarters that you undertake a new activity or a special promotion (such as early Christmas sales or the introduction of a new product or service) and too low during quarters when spending is down but you reap benefits from an earlier investment in social media.
In Figure 2-1, Rapport Online ranks the return on investment, defined as cost-effectiveness in generating leads, for a variety of online-marketing tactics. The lowest ROI appears at the bottom of the cube, and the highest appears at the top.
Courtesy of Rapport Online Inc., ROI
FIGURE 2-1: Social media would fit near the top of the ROI scale for Internet-marketing tactics.
Social media marketing runs the gamut of rapport-building options because it involves some or all of these techniques. On this scale, most social media services would probably fall between customer referral and SEO or between SEO and PR/link building, depending on the type and aggressiveness of your effort in a particular marketing channel. Traditional offline media, by contrast, would have a lower ROI than banner advertising.
If you garner leads online but close your sales and collect payments offline, you can frame CAC as the cost of lead acquisition, recognizing that you may need to add costs for staff, collateral, demos, travel, and other items to convert a lead.
To put things in perspective, remember that the traditional business school model for offline marketing teaches that the CAC is roughly equivalent to the profit on the amount a customer spends during the first year.
Because you generally see most of your profits from future sales to that customer, you must also understand the lifetime customer value (how much and how often a customer will buy), not just the revenue from an initial sale. The better the customers, the more it’s worth spending to acquire them. Harvard Business School offers an online calculator for determining lifetime customer value at http://hbswk.hbs.edu/archive/1436.html.
Small businesses (fewer than 100 employees), new companies, and new products usually need to spend toward the high end of the scale on marketing initially — perhaps even more than 11 percent. By comparison, mature, well-branded product lines and companies with a large revenue stream can spend a lower percentage on marketing.
Obviously, anything that can reduce marketing costs offers a benefit. See whether your calculation bears out that cost level for your investment in social media.
