Most recently McAfee commented:
"what’s the real problem if some E2.0 environments are mutually inaccesible walled gardens?... The only honest answer is that we don’t really know yet, and maybe this kind of technology Balkanization will turn out to be no big deal within enterprises. But I can think of two reasons why it might be a problem, or at least sub-optimal."
He then goes on to looks at impact of these walled gardens on emergence and what he calls, broadcast search.
This reminds me of a comment I made a while ago challenging the ease of implementing blogging, at a technology level, into a corporate environment. I have actually seen this happen in practice, where a blogging platform was introduced built using one technology that was completely inaccessible from the rest of the corporate IT environment, other than visiting the site with a Web-browser. I think it is still a big assumption from John Howard (not the Aussie Prime Minister!) who adds to the discussion that:
"Data no longer sits in a database hidden behind an opaque data access layer, it’s available as RSS and URLs, and can be linked too. To really make this stuff fly in an organisation you need an aggregation tool to close the loop."
Getting the aggregation tool in may be the stumbling block, rather than the individual social software applications.