So, turns out someone has already come up with the phrase "BlogCrumbs".  Possibly more than one definition (none was defined on the WikiPedia), but I was feeling lucky.. and here's what they have to say:

From BlogLiners:
"Let's try an experiment we at Blogliners call "Blogcrumbs". When you start your run of daily blog-reads, instead of the usual comment take a bit of one blog, and drop it at the next. When you get to the last blog, take a piece of it and drop it back at your starting blog. We did this by prefacing it with a small blurb such as...

In an effort to be different today, i'm taking a bit from the last blog visited and dropping it at the next. For you i leave:

"Blah blah blah". (<--- the blah blah blah part would be the bit you've taken from the last blog visited - a word, a line, a paragraph)

You'll find it's not only fun, this idea also solves the problem of not knowing what to say, plus the recipients realize you do more than drop a comment and move on. Also, you can discuss what you dropped with whom on your own blog thus having a ready-made entry for an uninspired day."

Not exactly the definition I had in mind, but I think more appropriate to the term.. my definition definitely needs its own coinage though.. how about "BlogTangent", "BlogWeb" or  "BlogThreading".. any ideas?

p.s. I didn't search for any of the three above on the WikiPedia or Google yet.. I'll do that at some point unless my fearless readers beat me to it.