Many social media platforms only respond when they get a large number of people posting at the same time, about one thing, as in trending topics. The site Thunderclap, while may not make you trend, does help you gain traction online, and notice with social media hubs such as facebook and twitter. It has a number of different levels, of which some are paid, but it has a free level as well.
You do have to do some work, for the free one you have to get 100 people to sign on to your campaign, and then when you reach your target of 100 accounts, at a certain time, all the accounts release a message about your work you are promoting, and they gauge that in a number that they call social reach, which is normally in the tens of thousands.
So another useful tool in your arsenal for distributing you work online, do let me know if you try it and how it went.