Facebook has "notes". It hasn't killed those services because it's geared more towards private use than public, and Facebook's other features (photo and link sharing) have replaced most of what people used to use private blogs for.

Totally disagree, a blogging platform is not a feature ... status updates is

is there a difference between status updates and microblogging?

Look at it like this: status updates on facebook => telling someone sitting next to you you're getting married. microblogging => having a wedding shower. It's all about the broad spectrum of recipients and how the data is distributed, at least imo.