I believe the old saying goes something like this:
If all you have is a hammer, the whole world looks like a nail
The ultimate goal of installing communication-oriented software is to improve an organization’s information exchange in some sense, but a weblog will not always be the most appropriate tool for the job.
A weblog is a monitored two-way communication device. A select few can post entries, but anyone can leave a comment. This type of architecture is good when there are privileged groups of people running the show, but what if the goal is to have a massively-collaborative website? Then you need to pull out the toolbox and fish around for something else (working the analogy for all that it’s worth!).