Can I be sued for posting taped audio conversations on youtube or a blog.

There are two questions here: 1) the legality of making and publishing the recordings via your blog; and 2) whether you would be liable for defamation (libel/slander).

In NY, it is generally permissible to record a conversation you were a party to without the other parties' consent or knowledge. In this regard you might be on solid ground.

However, whether you can be held liable for defamation (as opposed to be sued, since as mentioned, a lawsuit can be commenced regardless of its chances of success), is entirely dependent on the content of the conversations and the content of your blog introducing them. Truth is always a defense to defamation (again that may not keep you from getting sued). However, you should be concerned about whatever was said during the conversations by you that could be used against you as well as your blog copy. You should understand that opinions that can be construed by third parties as fact can be considered defamatory.

Invasion of Privacy/Right of Publicity could also be asserted against you as legal claims. However, the success of those claims is in large part dependent on your specific duty to them as a former employee regarding confidentiality and whether or not your blog has a commercial element to it. You may wish to assess both the actual job you held and whether or not you signed any agreement requiring confidentiality (which could also form the basis of a breach of contract claim).

I hope this helps.

Disclaimer: This answer is for informational purposes only and does not constitute general or specific legal advice, nor create an attorney client relationship.