A good example of this can be found on SoundCloud. They load a placeholder image that represents the common sharing widgets and then let the real widgets load over them. The problem is that the font rendering makes it look weird on any platform except the dev platform: http://i.imgur.com/lejjI.png
Oh yeah, that's an annoying one and we have that problem too. We have sharing controls that reload as you cycle through images - but the delay / iframes reloading for the share widgets looks terrible. To get around it we use fake versions like soundcloud.
