Everyone has some form of social media. Let's just talk about Facebook for simplicity. First of all, if you do not have an artist account you need to make one ASAP.
You can put pictures, videos, and just about anything on there. What you SHOULD NOT be doing is spamming people. I hate seeing music video links in every comment section, sometimes I see them multiple times! Just stop!
There hasn't been one time that I've ever clicked on a link from there.
Use your artist page to
1) Promote you music.
2) Engage with fans.
3) Show love to your fans.
One last thing, Facebook allows you to schedule posts. Use that feature to allow yourself to put out a couples posts a week. Just something simple. Brief Thoughts.