The Twitter button I was using is no longer listed in the web store which is a shame.
I'm now using Hootsuites Hootlet which is very good as once I had set up my personal account and business accounts on the site (https://hootsuite.com) I can use the Hootlet button to tweet from all my accounts which wasn't possible with the previous button.
So that's an excellent edition to Chrome if you have multiple Twitter accounts or lots of social media accounts including Facebook and Google+, see screenshot for a full list of accounts you can add.
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