MickMel SEO

Google hosted a 30 minute “webinar” today, with a focus on site targeting — creating ways for advertisers to target areas of your site to advertise on.  I’ll probably post about that in a few days when Google releases their summary of the webinar.

However, one interesting bit of discussion popped up in the Q&A portion of the webinar.  Google advised webmasters to use the 300×250 ad unit, as that is preferred by advertisers (especially for image and video ads).  However, some of the attendees said that they get a higher CTR when they use the 336×280 unit.  Google agreed that it was often the case, but that you’d probably get a higher CPC if you used the smaller unit — especially for image ads.

Another user asked if 300×250 image/video ads could show up inside of the 336×280 ad unit.  Google gave a clear “no” to that.  They said that advertisers can build a creative in both sizes, but image/video ads only show in the size they were created for.  The text ads, of course, can float around to any of the ad units.

As a result of that, I’ve swapped out a few of my 336×280 units for 300×250’s.  I’ll track the channels and see how it goes.

Any of you have previous experiences comparing these two sizes?