While that's possible, I wouldn't recommend tweaking the actual code, because then it's going to break every time the plugin is updated.

You could consider modifying your theme, or having a child theme that just doesn't output the title on these specific posts. Of course if you modify your theme, you end up with the same issue of handling updates.

I thought I had some filters in there that would allow you to change this sort of thing, but I've just looked and it turns out I don't. Oops. Seems like the best I have currently is the keyring_post_imported action that's fired at the end of each imported post, which allows you to then act on that post (e.g. and remove its title). https://github.com/beaulebens/keyring-social-importers/blob/master/importers/keyring-importer-instagram.php#L341 That is passed the slug of the service, so you could hook into it and only remove titles on posts imported from instagram.

I created this issue to track ideas for allowing for better filtering before importing content. https://github.com/beaulebens/keyring-social-importers/issues/17

Cheers.