In the UK (and most, if not all, of the EU):


some supermarkets have recycling bins for small batteries. 
Every community has a household waste recycling centre with containers for old batteries (including both lead-acid car batteries and small appliance batteries like AA batteries).




EU Directive 206/66/EC says


  In order to protect the environment, waste batteries and
  accumulators should be collected. For portable batteries
  and accumulators, collection schemes achieving a high
  collection rate should be established. This means setting
  up collection schemes so that end-users can discard all
  waste portable batteries and accumulators conveniently
  and free of charge


What's the best method to responsibly dispose of used alkaline batteries?
The new Facebook Page Manager app (in combination with my less than stellar thumb accuracy) has had me inadvertently deleting comments (when I've been trying to like them) left and right. Is there any way to undo this?

If not, is there any way to tag a person who is a fan of the page and who commented on the post/picture but whose comment you deleted? I assume the answer is no since you cannot (acting as a page) tag someone in a reply who has not yet commented on a given post, but didn't know if anyone knew of any workarounds...
