What is a hash-tag Conference?

It will take place on Twitter and at the hash-tag #PressFreedomDay. Speakers and audience are the same. Everyone can participate through a tweet with text, audio comments or video. It's up to you.
 This conference is open for everyone and an attempt to record and depict the positions, opinions and respective views not only of a number of prominent personalities of the academic, journalist, business and professional communicators’ respective sectors but also of bloggers and citizens. It aims to exchange opinions and views on the current and emerging state of Press Freedom.