What are some key things I should have on my resume for an entry-level position in marketing?

[S]

It's all about how you sell it, obviously, since it is marketing.

If you do not think your social media marketing experience was that important, then others won't either. In reality, social media marketing is the newest "buzz" in traditional marketing and many will appreciate your experience in that field.

What did you do? Did you target demographics? Post consistent content that increased followers and engagement and brought in more business? I am sure you had some accomplishments, and if you establish yourself as an authority in that niche you will have a skill that many traditional marketers do not have.