Frequent Blog Updates

Wow... on Easter Monday after some blogreading, I managed to get all (about 70) blogs in my 'root' directory into the 'read' state. Blogs I read frequently or for which I haven't yet decided on the category they belong to, reside there. This morning - maybe 36 hours later - I find 40+ of them have new content available. Is this an after-Easter blog rush, or is it just that these blogs update frequently?