Facebook & Pinterest button questions

I’ve been playing with the Facebook and Pinterest buttons and I have a few questions I’m hoping someone can answer.

  1. What is the difference between the Facebook Like and Follow buttons?

  2. Is there a way to use the Pinterest Pin-It button in an iframe instead of the anchor+script combo?

  3. Can the Pinterest button be made to always display the number of pins, even if they’re zero?

  4. Is there a way to prevent the Facebook Like button from displaying the number of likes?

  5. Does anyone else have a problem with the Facebook Like button sometimes disappearing after being clicked? It reappears upon refresh.

Please let me know if you have any idea on any of these.