First off, I must apologize to everybody for my post a couple months ago about dayparting on Facebook. I saw the new campaign lifetime feature on Facebook and mistook it for day parting. I hurriedly made a post and then realized my mistake. So, if you came to my blog hoping for dayparting, I’m sorry for leading everybody on. I just got super excited and wanted to be the first to blog about it.
I also must tell you I was quite pissed because I had done a lot of testing for this particular case study to see how CPC compared to CPM and right in the middle of my testing Facebook started displaying a fourth advertisement, so I had to throw that data away.
When I originally started advertising on Facebook all I did was bid CPC as there was less risk and bid prices were cheap. I stuck with that method for months and never tried CPM. Shortly after ASE 2009 I moved over to only CPM bidding and never looked back. Earlier this year I moved onto other traffic sources and quit paying attention to Facebook. Here recently I’ve gotten back into advertising on Facebook. I noticed the suggested bid prices for CPC and CPM were both outrageous. I did remember a big hoopla from Facebook earlier this year during my exodus about how you should bid CPC for better positions and all that. The last 4-6 weeks I’ve been noticing some people suggesting bidding CPC for best results. I never really saw any definitive information or statistics backing either side so I decided to turn this into a case study.
There are two main bidding types when advertising. They are known as CPC or cost per click and CPM or cost per thousand impressions. There are advantages and disadvantages to each type. Below is a synopsis of both bidding types. Choose what you feel is appropriate for your particular campaign or do a split test to see what does best for your needs.
Cost Per Click – CPC
When you choose the CPC bid type, you’ll be charged every time someone clicks on your ad. This option is less risky, especially if you’re entering a new niche and aren’t sure how well your ads and especially images will perform. I’ve found if you can get a high enough CTR, preferably below your EPC, you can bid this type and should be able to see some longevity with your campaign.
Cost Per Impressions – CPM
When you choose the CPM bid type, you’ll be charged for every one thousand impressions your ad receives. This is an especially good option if you’re a branding advertiser. If you’ve been advertising in your niche and know what kind of ad copy and images work well, this may be your preferred bid type. A general rule of thumb is if you can get a CTR above 0.10%, choose this bid type because your CPC will be cheaper this way. You’ll want the highest possible CTR when bidding CPM. The higher your CTR, the cheaper your CPC will be. However, when bidding CPM, you will need to constantly monitor your ads to make sure your CPC is still below your EPC.
The stats for each campaign is below. I’m not going to reveal the actual campaigns and exact targeting because these are two of my super stable campaigns that have done very well for me in the past and continue to do so. However, I will tell you that that Campaigns 1-4 are a niche US dating offer and Campaign 5 is a broad dating offer in Canada. I ran the same set of ads in each campaign and I bid the highest CPC and CPM suggested by Facebook.
| Campaign |
Bid Type |
Impressions |
Clicks |
Campaign CTR |
Avg. CPC |
Conversion Ratio |
| Campaign 1a |
CPC |
547,223 |
519 |
0.095% |
$0.49 |
13.46% |
| Campaign 1b |
CPM |
1,753,513 |
518 |
0.030% |
$0.49 |
9.24% |
| Campaign 2a |
CPC |
484,541 |
474 |
0.098% |
$0.54 |
11.49% |
| Campaign 2b |
CPM |
1,508,219 |
442 |
0.029% |
$0.57 |
8.98% |
| Campaign 3a |
CPC |
205,580 |
649 |
0.316% |
$0.34 |
17.3% |
| Campaign 3b |
CPM |
786,554 |
488 |
0.062% |
$0.40 |
17.06% |
| Campaign 4a |
CPC |
198,230 |
476 |
0.240% |
$0.46 |
14.48% |
| Campaign 4b |
CPM |
717,830 |
479 |
0.067% |
$0.42 |
15.53% |
| Campaign 5a |
CPC |
750,237 |
1281 |
0.171% |
$0.16 |
8.35% |
| Campaign 5b |
CPM |
1,758,765 |
524 |
0.030% |
$0.21 |
5.47% |
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Conclusion
As you can see from the results, CPC was the way to go in each test except for one. I’ve done countless other CPC versus CPM tests and 95% of the time CPC comes out on top. I know the bids are extremely high, but just try it out. With CPC, you’ll notice your CTR is way higher and conversions are typically better. Bidding CPC will also be beneficial to you because your target demographic will be less prone to banner blindness. CPC bidding will add longevity to your campaigns, while you will need to continually monitor your CPM campaigns. I’m not sure why conversions are better. I didn’t check my Prosper202 logs to see if most of my CPC traffic came from Facebook or if it was application traffic. Because of these results, I do believe that CPC ads are placed in the top 1 or 2 spots and that CPM traffic goes mostly to the bottom spots. There is a CTR apex where it will be more beneficial to run CPM instead of CPC, but I haven’t yet figured that out because you’ll need to also factor in CPC and EPC for each ad.