feat: Add social-media use-cases for Facebook, Twitter, Instagram

[jnv]

Description

This is straight from social-media-demo repository.

Motivation and Context

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have read the CONTRIBUTING document.
• [x] I haven't repeated the code. (DRY)
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[jnv]

@janhalama I have ported this over, but haven't added any tests, could you please take over?

[janhalama]

@janhalama I have ported this over, but haven't added any tests, could you please take over?

I am going to take over this PR and add tests.