I will only post your ebook in groups releated with books. I have also a Twitter account with more than 11.900 followers and a lot of retweeters. I only add people interesting in reading in my account so I have a focused audience.
I will not just post on Fb and Twitter. I will do that in a rate of few tweets a day at different hours every day and 40 submissions to Fb groups a day. I'm doing this so you can get the maximum exposure out of it.
I also provide a list of groups on Fb that I submitted your work with the date I did so, so you can check it out. You can also follow me in Twitter and see the Tweets.
I work at a marketing team of a publishing house so I know all the tricks.
I accept all genres!