LDS.org contains a lot of things like the Church magazine clear back to 1971, do I think everything in those magazines is a "Thus saith the Lord" no, not by a long shot.
As an example in the January 71 issue there is a rather short article on the restoration, it's not detailed at all and since that time the Church has had all of Joseph Smith's papers digitized with tons of new information is to be had.
This month there is an article on anxiety. It's full of good ideas to help people with this problem, is it a 'Thus saith the Lord', no! Two months from now someone will come up with a pill to cure it and the information will change.
There's a list of upcoming events, if something gets canceled are you going to have a heart attack because something authoritative got changed?
There are youth programs to help them be more spiritual, next month someone will come up with another good idea.
Under the Church News section there is an article about getting enough spiritual light or spiritual vitamin D. Is it authoritative? Well there is nothing in there false but it's just a suggestion to look at our lives. It quotes Dumbledore: “Happiness can be found even in the darkest of times, if one only remembers to turn on the light.” He's sure not authoritative or even real but it's a good thought.
There are articles within LDS.org which are authoritative, the scriptures can be accessed through there. There are the Testimonies of the different Apostles and Prophets. I think all the General Conference talks are pretty much authoritative but what do you expect to find in them? You can go here to read through last Octobers conference.
www.lds.org/general-conference?lang=eng