Users will need to have a small bit of Hive RCs and Broca to post. As the co-founder of a web3 skin called 3speak.tv, we plan to offer our users a free experience giving out small bits of BROCA to new accounts and delegating RCs (once available) so the user just signs up and starts posting.
Sites are what make this technology "idiot proof." However, it allows anyone to go outside of the sites (skins) and go directly to the source and post, but they will need some RCs and BROCA to do so, but that's the cost of freedom from reliance of others.