Facebook has seen a great deal of growth over the past few months, especially on the video front. That said, some companies are still having a bit of struggle when it comes to finding an effective advertising program on the popular social site.

Pocket Gamer recently ran an article talking about how the over-saturation of the channel is making it difficult for some companies to find success — namely mobile game developers. A report from Nanigans indicates that while the click through rate for gaming ads on Facebook continues to grow (up to 150 percent from the previous year), it dropped nine percent in a quarter-on-quarter measurement. And it’s not due to the holidays, either, as the drop has been ongoing for a six-month period.

As you can see, CTR-related gaming ads have seen a big rise over 2014, only to stay stagnant and, in the first quarter of 2015, drop down the nine percent. Part of this may be due to boredom, with users not willing to look at ads that pop up randomly in their feeds.

The CTR for eCommerce in general across Facebook apps has seen a great increase, though, up 281 percent year-on-year and 12 percent quarter-on-quarter, which indicates a loss of interest with certain game ads.

Part of the issue may also be with what the cost per click — or CPC — costs for companies that produce Facebook ads. The rate has risen an approximate 11 percent quarter-on-quarter, and 69 percent year-over-year, from $.47 to $.80. While that’s not a big deal individually, it adds up with each new click that the ads get. (Measurements for 1,000 impressions calculate at $5.17, a 324 percent rise over the previous year.)

So what does this mean for advertising on Facebook in general It’s still quite popular, but some mobile game developers may be looking elsewhere to advertise its wares unless Facebook can come up with something more effective to make its games shine again. It’ll be interesting to see where these trends wind up over the course of 2015.