def getTwitterImages():
    twitter = Twitter(TWITTER_USER_ID)
    dropbox = Dropbox(USER_NAME, 'twitter')
    xml = Xml(TWITTER_USER_ID, 'twitter')

    xml.createXmlFile()
    dropbox.makeDropboxFolder()

    timeline = twitter.getTimeLine()
    url_list = []
    for tweet in timeline:
        img_url = twitter.getMediaUrls(tweet)
        if img_url is not None:
            url_list.extend(img_url)
    not_download_url_list = xml.compareXmlAndWeb(url_list)

    for url in not_download_url_list:
        path = twitter.downloadImage(url)
        dropbox.uploadPicture(path)
        xml.insertPicUrl(url)
        os.remove(path)