private String resolvePhotoUrl(Result result) {

    if (result.getAuthorUrl() == null) {

        return null;
    }

    if (result.getAuthorUrl().startsWith("http://www.facebook.com")) {

        String chunks[] = result.getAuthorUrl().split("id=");
        String profileId = chunks[chunks.length - 1];
        return "https://graph.facebook.com/" + profileId + "/picture?type=small";
    }

    if (result.getAuthorUrl().startsWith("http://instagram.com")) {

        return "https://avatars.io/instagram/" + result.getAuthor();
    }

    if (result.getAuthorUrl().startsWith("http://twitter.com")) {

        return "https://twitter.com/" + result.getAuthor() + "/profile_image?size=bigger";
    }

    return null;
}