Schedule 5 minutes to skim through the .pdf of Twitter 101.
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or right click and Save Target As to download .pdf file to your device.
An in depth review of the advanced uses of Twitter and associated ad ons, groups and resources:
published by http://www.webdesignerdepot.com
60 useful ad ons for Twitter:
published by WebGeek
and if you like my twitter background and want to get into creating one for yourself/your clients or just learn more:
HOW TO: Create Custom Twitter Backgrounds thanks to Ben Parr and Mashable.com