def load_tweets(tweet_file):

    """ Load and process a Twitter analytics data file """

    # Read tweet data (obtained from Twitter Analytics)
    tweet_df = pd.read_csv(tweet_file)

    # Drop irrelevant columns
    tweet_df = tweet_df.drop(tweet_df.columns[[13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39]], axis=1)

    return tweet_df