Yeah, you have more success driving your own social media campaign than dumping and running on social media.
I personally am on a few social media outlets: twitter, instagram, pintrest, fb, and raverly. I mainly use twitter and instagram since that's where i had most success when I started using it consistently. FB is the worst unless if your willing to pay for it.
The only place I "dump" my items is Raverly, and it has paid off. I have received several sales from that site. I find it interesting that I have had more success there than on Pintrest. I know that Pintrest is for the DIY-ers, and is filled to the brim with knitting/crocheting patterns. I have only gotten moderate views from there, but no sales. I figured my target market is not Pintrest, so I no longer choose to spend my time there, even to "dump" my listings there.