We've been sharing deeply personal indie hacker stories on our Instagram account all year, and growth has been pretty steady.
(You can check out a chart here.)
We bootstrapped the first 1,000 followers from the IH mailing list. We've continued to send out new posts in our mailing list every week, and we've also experimented hashtags, with different story types and lengths, with IG's "stories" feature, and a few other things.
But nothing has moved the needle like influencer marketing. We've done two or three stories with IG influencers who also happen to run businesses, and their shares have given us a noticeable bump in follower accounts every time.
Still a lot to learn here, as IG doesn't seem quite as easy to grow as Twitter etc, in part because there aren't as many indie hackers there, and in part because there aren't any native retweet/mass sharing features.