Disclosure is a broad brush to paint with and extremely subjective.
When an inventor tells people about their invention it does not necessarily mean they have disclosed it, it does mean that another person on the planet knows about what your working on and may or may not tell someone else.
Disclosure is more about placing your invention in a situation where the general public can gain access to it without you having any control. A great example of this would be a trade show, or as I’ve seen done a time or two – Inventors listing them on forums or blogs.
The simple rule of thumb is – if you post your invention in an area the general public can see it and you can’t control who….then you’re probably dancing on the line.