I speak about many things on my blog, but even when I use the "it was in my blog" line, it's for example when I post pictures (I talk to the person about something, and point them to the corresponding post for the pics) or when I'm telling something about one specific incident, and don't want to rehash the story (I'll send the link to the post, and discuss anything related to it) .
But a cold "It was in my blog" as if everyone was supposed to read it ? Nope, can't do that. I know for a fact that not everyone reads blogs, and I'm not going to use it against people.