There was an eye-opener for me that has ramifications for user experience. I was being given a demo of a website, and the most hated thing on the website were the social media buttons:
This was a major surprise. Somehow one has to convey the fact that they can be found on social media without the gaggle of social media icons. Perhaps there may be a separate page or menu item called connect that hides itself unless invoked, or it uses a jQuery layer that goes away.
One would have never guessed that there is "fatigue" from social media buttons. Check out clearmeter.com.