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Just released my second simple Vanilla plugin this evening. I think it is something that can add a lot of appeal to your vanilla forums without a lot of work.
Simply paste the URL to a tweet a comment or post and my plugin will automatically embed the tweet into the posts. It's similar to embedding youtube videos within a post.
Check it out, let me know what you think and how to improve! Vanilla Twitter Embed
Feel free to look at the source code and help me improve on the product.