site/_src/_includes/team.html

<div class="grid grid--full grid-small--half grid-medium--third grid--gutters text-center grid--team">

    {% assign team = site.data.team | sort: 'name' %}

    {% for member in team %}
    <div class="grid__col">
        <article class="team">
            <img class="team__image" src="/assets/img/{{ member.image }}">
            <h1 class="team__name">{{ member.name }}</h1>
            <p class="team__position">{{ member.position }}</p>

            <p class="team__social">

                {% if member.twitter %}
                    <a class="team__social__link" href="https://twitter.com/{{ member.twitter }}">
                        <svg class="icon icon--social icon--twitter" aria-labelledby="title">
                            <title>Twitter</title>
                            <use xlink:href="/assets/img/sprite.svg#twitter"></use>
                        </svg>
                    </a>
                {% endif %}
                {% if member.facebook %}
                    <a class="team__social__link" href="https://facebook.com/{{ member.facebook }}">
                        <svg class="icon icon--social icon--facebook" aria-labelledby="title">
                            <title>Facebook</title>
                            <use xlink:href="/assets/img/sprite.svg#facebook"></use>
                        </svg>
                    </a>
                {% endif %}
                {% if member.github %}
                    <a class="team__social__link" href="https://github.com/{{ member.github }}">
                        <svg class="icon icon--social icon--github" aria-labelledby="title">
                            <title>GitHub</title>
                            <use xlink:href="/assets/img/sprite.svg#github"></use>
                        </svg>
                    </a>
                {% endif %}
                {% if member.linkedin %}
                    <a class="team__social__link" href="https://www.linkedin.com/in/{{ member.linkedin }}">
                        <svg class="icon icon--social icon--linkedin" aria-labelledby="title">
                            <title>LinkedIn</title>
                            <use xlink:href="/assets/img/sprite.svg#linkedin"></use>
                        </svg>
                    </a>
                {% endif %}

            </p>

        </article>
    </div>
    {% endfor %}

</div>