iframes are common, but it depends on how they are being used. However, I think everything here relates partially to my theme and how it functions with the script that calculates the heights of the sidebar and content columns based on what is published in them. Something about the social plugin code and that particular iframe for the Giveaway page is not being seen as “content” in the page by the script. The script is not seeing those two items to calculate the column heights….kind of techy I know.
I will see what I can do with this today, as well, look for an alternative social plugin for you.
If you decide to add JetPack, I will leave that one to your decision. I haven’t totally explored JetPack, but I see it does offer social sharing, among all the other things. I used part of Jetpack in testing some things as well on the demo site…also tried out their contact form too.