Blog Post
Hello Skip Shuda,
Thanks for the thoughtful and inquisitive comment. There is definitey differences in expressive power for different social media channel. That is why bandwidth is defined "The influencer's ability to transmit his expert knowledge through a social media channel" in the article and it depends on the particular channel, or what you called medium in your response. This is also why I included the alignment of channel as the 5th factor. Very good observation :)
As you mention, timing is also channel dependent. I would imagine that if you need to do analytics on twitter data, you probably find some ways to save and aggregate the tweets first. But if you do it directly from twitter search, then the temporal sensitivity (timing) would be very narrow. However, twitter follower/following data are persistent over a much longer time range, and that seem to be a metric that lot of people like to user to determine influence, where in fact they can only fine high bandwidth users that may be, not credible in the domain of interest, irrelevant and have poor timing sensitivity.
For your question, the next article in this miniseries is already out, and it explains the various types of metrics or data for determining a influencer's bandwidth and credibility.
Finding the Influencers: Influence Analytics 2
For timing and relevance, it is more difficult to simply have a metric because it depends on the target as well. That means we cannot derive a metric for the relevance or timing of an influencer. We can only have such metric for a influencer and a particular target in mind. However, in the following post (part 3) of this miniseries, there are data manipuations that we can perform to accomplish relevance and good timing. So stay tuned!