Everybody has a congregation. People within their sphere of influence. When a blogger communicates to readers, he (or she) is talking to their congregation, in a sense.
The question, is are they communicating something worthwhile? Are they bettering the lives of those they are communicating to?
These are things worth thinking about for any blogger. Now, not every post has to have a serious tone, there’s a place for things such as humor, entertainment, etc. I’m not slamming these things at all.
Ultimately, a blogger wants their readers to leave their pages better off than when they first came to them. Whether it’s through having learned something, gaining inspiration, or any other capacity possible.