When I first joined Kbin I posted threads due to being a reddit refugee but have started posting microblogs as time went on. I have also noticed some magazines have more threads while others have more microblog posts. For example kbinmeta has more threads while the most active magazine I moderate has mostly microblogs.
is for writing small posts with hashtags
hashtags start with #
microblog posts can have attachments like threads can
if you click on hashtag you can see more posts with same one