What are the three most important things you are doing to grow your platform?
The three most important things I do to grow and maintain my author platform would be my Facebook page, Twitter and my blog, with all three linked to each other. I could do much better in all areas, but there’s a fine line between the amount of time spent on maintaining the platform and that spent writing new material. There's no point spending time on building a platform if this is static, with no new books or material or items of interest to attract existing and new readers.
When first building my author platform I looked at most social media sites, tried a few, then cut back to what was manageable (and comprehensible) for me.
The following list comes courtesy of
Top 15 Most Popular Social Networking Sites | October 2015
I still maintain LinkedIn, Goodreads, Pinterest and Google+ accounts although I'm less active on these with my highest rate of activity taking place in the lead up to publishing a new book and the initial promotion stage.