We got 1k sign ups from Twitter, anyone wants to try this strategy for your startup?

Hi guys, two years ago my friend and I built a productivity app and we managed to get ~1k sign ups to our waitlist solely from Twitter. We just searched for tweets where people talked about productivity and replied to those tweets sharing some productivity insights and mentioning our app.

This strategy was very effective for us, but it was very time consuming to search for relevant tweets. I'm now building a tool that automates this process. It monitors Twitter and sends you a notification when someone posts a tweet that is relevant to your startup, so that you can reply to this tweet, add value to the conversation and tell people about your product.

Anyone interested in testing the tool once it's ready?

Also, please share your story if you used this strategy for your startup - what was the product / audience and how effective was this strategy for you?