Hmm? I think Quantified Self is fairly different from what (I assume Mati Roy) intended this tag to focus on.
My guess is we want to rename this tag to "Quantified Self" since that sure seems like it should get a tag?
Lifelogging is the practice of intentionally recording one's life, whether for life extension purposes or any other purposes
Agreed. Lifelogging and quantified self have a lot of overlap, but generally refer to distinct clusters. Lifelogging is more about capturing high resolution data about someone's life, such as audio or video. Quantified self refers to low resolution statistics, such as heartrate and time spent sleeping. The aims of the two are often different too. Lifeloggers (especially on Lesswrong) will probably be more interested in lifelogging as a means of life extension, whereas that rarely seems to be the goal for people who are interested in quantified self.