This is false. My girlfriend works in social media at a Fortune 100 company. Just a few of their many products are geared toward babies and other things of interest to parents. She attends "mommy blogger" conferences, reaches out to people on Twitter and Facebook, and otherwise works with people who have a substantial audience in order to advertise with them.
Big companies are much more likely than small companies to even have such a role. They are very interested in promoting themselves and increasing their profits in any way possible. There's absolutely no reason they wouldn't be interested in something like r/parenting
By bother he meant spend a bunch of cash, not @reply to people on Twitter. They can hire your girlfriend to submit stuff and comment on reddit all day, but that doesn't give reddit any revenue.
My girlfriend doesn't work the spammer role that you seem to be envisioning. Her job is to discover an audience that is actually interested in the products her company offers and to reach out to them. Part of that job is to manage the Facebook presence for products that have well over 100,000 followers. Another part, as I said, is to find relevant blogs and other websites frequented by visitors of an appropriate demographic as a platform for their ad campaigns.
I brought real information to this thread. There was no reason whatsoever for you to shit on that.