I think that Mumsnet tends to attract highly-educated, professional women - as well as all the other examples of women, including those who earn a moderate salary or who don't work. I think that the former - upper middle class women - possible wouldn't normally bother with a mainstream forum, as they'd see their own perspective as rarified and might want to avoid some of the exaggerated emotions and bile which tend to appear on some forums, but they think they will find their own 'tribe' ( as they annoyingly like to express it) on Mumsnet. When I say bile, I am thinking of community forums, such as Nextdoor, on which posters tend to take photos of people littering and post expletive- laden rants in order to signal their own relative respectability. Mumsnet has some irritating dog-whistle posts, from time to time, in which poster write about the size and quality of their inherited engagement ring, to signal to other members of the modern day gentry that they are of the right sort. I think there is a wish, at times, for posters to identify which anonymous posters have a similar lived experience to their own. Then, you get posters who are inexperienced, I think, and who literally think that Mumsnet is a forum where they can gain information about privileged problems, such as will you be given your six figure bonus, during these difficult economic times. Another example would be posters asking for advice on where in London to buy a four bedroom home if you have £900 k to spend, as if Mumsnet actually.is a forum for high-earners. On these threads you will find some posters slipping into derogatory references to Woolwich, ( which is near me).and other perfectly nice places to live.
But the premise of Mumsnet, that you post anonymously on a forum about child raising, seems to me, in a way, to be tailored to a population of mums, for whom work and achieving professionally has been the priority since uni, and maybe they are more dislocated from people in the community who might otherwise give that advice - due to working long hours, etc. Also, because of their education, they tend to.read up on scholarly papers to learn things, rather than using common sense. I was thinking of a post about leaving your kids while you study abroad for a few months, and someone asking if anyone had read the latest expert research on harm done by leaving your young kids for a few months, as if everything can be clarified by PhD dissertations.
However, Mumsnet is a useful forum for gaining information which you'd normally need to pay a lawyer to tell you, and posters are usually helpful and broad-thinking. Also, well-off people are often well-educated and probably clever, so having such people contribute to a forum is obviously going to be helpful - at times, anyway. Usually responses are geared to taking into account that people reading and learning and being supported will have a range of experiences. The money-saving posts are helpful.
Generally, I think Mumsnet represents a.broad range of experience and views and is, overall, helpful rather than negative. I do, however, think that posters who suggest an unconscious racial bias, probably need to.be.listened to, as they probably have good points to make, and certainly are putting forward evidence of comments which ought to have been challenged, balanced by a comment by a moderator or, perhaps, closed.down. But maybe MN is a place for people to learn and develop and challenge their own ways of thinking.