I'm still on HN, LinkedIn and WhatsApp. Every time I open LinkedIn I'm shocked at how addictive the feed is. I go there to message someone and before you know it 10 minutes have gone by and I forgot what I went to do in the first place. WhatsApp is really great, except that is owned by FB and they still extract value from me.
In 2015 I turned off all notifications on my phone. Quiting FB and no notifications have really improved my state of mind.
Overall, I'm pretty happy with how I use social media, but I'm very worried about how my kids will be able to handle it in their teens.