I saw the film Contagion last night. Dreadful film. Don't waste your time unless the idea of seeing dear Gywnnie Paltrow looking pretty pale puts the groove in your kale smoothies.
Anyway, there's a line in the film where it says that we touch our faces 2,000 times a day.
It's true! I had coffee with my sister today and I was enthralled to watch her touch her face ....well, I couldn't keep up!
Am now obsessed with seeing how much people do it. I did it 12 times writing this post (one handed wonder!).
It is an evil which has bewitched me. And I'm sorry - you are how infected! 
Take heed, germ spreaders!