Here are some answers:
~ A blog turns out to be a nice personal archive about things that inspire and stuff one thinks about. (In most cases this will be a "sporadical" and "spot-wise" archive and will not be complete...)
~ Maybe a blog is a way to be "part of a public community"...
~ ...or one just wants to take advantage of new technology to easily publish content!? (It seems that technology does influence us more than we might think.*)
Alright then, if you want to find out about some things that inspire me from time to time, check out Juliation Blog and be welcome to comment there.