What are the ad’s strengths?
The appeal of the ad is that it is simple yet it gets to the point. There is elegance in the design, but it is only enhanced by the simplicity of the font and the logo. I think another strength is that the font is consistent in the description other than the (free) and (very easy, too) which makes you pay attention and re read. I think it was clever because you would think it would cost, but this is a way to draw attention to free.
What are the ad’s weaknesses?
There is little about anything the website offers other than it is a wedding website, its easy and free and that you can add photos and design it. Can you create a registry for your guests, is it for you or them?
What is the ad trying to accomplish with its design?
They are trying to drive traffic to their website and get new customers
How has the design used?
You can see that the color scheme is complementary. There is red and green and then orange and blue.
What metrics (likes, shares, re-tweets, etc.) will be used to determine if the ad is successful?
Traffic, comments, shares and reposts.