Is there a difference between a social intranet and an enterprise social network?

Jenni Wheeler over at the "Confessions of an internal communicatior" blog has written a thought provoking post called "Social Intranet or Enterprise Social Network? Is there a difference?"

In it Jenni ask whether we should separate all the different tools we use, intranets, enterprise social networks, wikis, forums etc, as they are all effectively just part of a single online channel. I definitely agree with this, especially in the context of the digital workplace where intranets are often regarded as the glue by which other tools are joined together.

What I especially like about Jenni's post is her description of the different levels of social interaction that users can undertake on the tools that are now available.

For me, a social intranet is different to an enterprise social network (ESN). For me, an enterprise social network is an online tool that is designed for collaboration. That is about communities and file sharing and creating a space for anyone to add news and information. Content can be liked and commented on and people are able to add their own status updates and more personal details to a profile.
For me this is a great way to describe the differences between these tools, but what do you think?