I suspect that it depends on the niche, and that some sorts of domains are more likely to find interested end users on social media than others. Domains that might be applicable to celebrities, bloggers, influencers, the artistic community, and nonprofits might be more likely to benefit from social media in my opinion.
Personally I have never tried Facebook, Pinterest, or LinkedIn with respect to my domain activities. I do see LinkedIn as a very valuable potential way to interact, and know a number on NPs that use it effectively.
I do use Twitter a bit for attempted promotion. If you do this I think it is really important to do it in a restricted fashion, and to make sure that you tweet valuable and interesting other material, and only occasionally about a domain name that you have personally. People that just tweet name after name with link where it is for sale I stop following. I think using graphics and ideally some creative approach is helpful.
I sold a new extension domain last month for low $$$ that I believe (not completely sure) had interest from end user start because I had mentioned this particular name in my blog a few weeks earlier. While you should not use your blog only to push names, if you are writing on something related to the domain name, it is a possible way to get some exposure.
So I see value in blog + Twitter + LinkedIn, but only when done sparingly, creatively, professsionally and somewhat indirectly!