def METHOD_NAME(self, data):
    """
    Map over the feed here to attach more information to each element.
    """
    content_strings = set()
    for item in data:
        activities = item.get("activities")
        if activities:
            # Aggregated Activity
            for activity in activities:
                target = activity.get("target")
                object = activity.get("object")
                actor = activity.get("actor")
                content_strings.add(target) if target else None
                content_strings.add(object) if object else None
                content_strings.add(actor) if actor else None
    if content_strings:
        cache = AttrCache()
        lookup = cache.bulk_lookup(content_strings)
    for item in data:
        context = {}
        activities = item.get("activities")
        if activities:
            # Aggregated Activity
            for activity in activities:
                target = activity.get("target")
                object = activity.get("object")
                actor = activity.get("actor")
                if target in lookup.keys():
                    context[target] = lookup[target]
                if object in lookup.keys():
                    context[object] = lookup[object]
                if actor in lookup.keys():
                    context[actor] = lookup[actor]
        item["context"] = context
    return data