best method of making a tweet-this button?

It looks like there's lots of different sites/methods for doing this,

is there an official twitter share button?

like for facebook there's http://dev开发者_开发百科elopers.facebook.com/tools.php?connect_wizard&wizard=stream_publish , which looks excellent

You can just use the button below and use one of many free social networking icons:

<a expr:href='"http://twitter.com/home?status=Reading " + data:post.title + " @YOURTwitterUSERNAME " + data:post.url' title='Tweet this article on Twitter' target='_blank'><img src='yourTwitterButtonURL'/></a>