I have a deployment error. When a password policy already exists, and I have updated it and deploy it via ANT I get the following error message:
"a password policy with this profile already exists"

Has anyone has this before and know how to resolve it?

Have a public site whose actions I would like to, through a trigger, create a chatter post. I know people have come to this issue before, i'm looking for good workarounds.

The first one I think of is having a batch to find the record of something the site user can update and having that batch schedule itself at the end. But I've seen this get very messy. The list of scheduled jobs gets very big and at some point you have the issue of a phantom job that prevents you from deploying code even in sandboxes. 

Another possible is to have an email service that accepts email sent from the site controller with the information of what post to create. I've never tried this before so not sure about any pitfalls asides from using email limit and it just being not nice.

Any other ideas/work arounds? Thanks.