% Initialize the HTML parser, which happens to ship with MATLAB.
htmlConfiguration = org.cyberneko.html.HTMLConfiguration();
parser = org.apache.xerces.parsers.DOMParser(htmlConfiguration);

% Keep trying until we get an answer.
followers = [];
for tries = 1:10
    % Dowload and parse the page.
    parser.parse('http://twitter.com/matthewsim');
    
    % Scrape the number out of the parsed page.
    spans = parser.getDocument.getElementsByTagName('SPAN');
    for iSpans = 1:spans.getLength()
        span = spans.item(iSpans-1);
        id = char(span.getAttribute('id'));
        if strcmp(id,'follower_count')
            followers = str2double(char(span.getTextContent()));
        end
    end
    
    % How did we do?
    if isempty(followers)
        % Probably the page didn't download correctly. Wait and try again.
        pause(1)
    else
        % We're done!
        break
    end
end

% Return the result.
updatetrend(followers);