From the security perspective, there should NOT be one. It depends on whose security you are safeguarding. That of the people, or a small number of services?

In the world we are moving to online, scuttlebutt and MaidSAFE and others will simply LACK a back end that even knows who’s logging in or what data is being sought. Protection of data would happen via end to end encryption. That is MORE secure than trusting someone to safeguard your data - not less.