I made an Instagram-based logo for an Instagram-based social network. I'm not sure how legal is using it because of copyright

This is the logo (ignore the Instagram first logo, it's there just so you can compare). Is this legal or ilegal to use in a social network?

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Background of the logo

The website is basically a free software & federated alternative to Instagram called PixelFed and it works just like Mastodon.

Great design resource

100 Things Every Designer Needs to Know About People (Voices That Matter) Submitted June 04, 2018 at 12:57PM by AlbertoAru https://ift.tt/2xCuget