Do you post on social media?

Question is self explanatory! Do you use other platforms to promote your stream and do you think it's necessary for growth? What do you post?

I have an Instagram and a YouTube account with the same name as my twitch linked to my profile, but I just started streaming a week or 2 ago and I have no idea what to post on them...

Tbh I was never really planning on taking streaming all that serious but I got invited to the affiliate program so I figured it'd be fun to try and maybe get some ideas for what to post and how to grow the channel!

I was thinking about maybe just posting about my day-to-day life like what I'm doing when I'm not on stream? But I have no idea... it should probably relate to the games I play, right?