Including tweets in a post is a 3-step process:
1. Edit your globalTemplate.
Scroll down to the bottom and right above the </body> tag add the following line:
<script src="//platform.twitter.com/widgets.js" charset="utf-8"></script>
2. Edit your ipb_styles.css.
The default .post_body .post class looks like this:
.post_body .post { color: #282828; }
You want to edit it this way:
.post_body .post {
color: #282828;
overflow-y: hidden;
}
3. Now create a new BBCode.
Example code:
https://twitter.com/qikipedia/status/263009977877278720
Custom Tag:
Tweet
Custom BBCode Replacement:
<blockquote class="twitter-tweet"><p>Javascript is not enabled OR refresh the page to view</p><a href="{content}">Click here to view the Tweet</a></blockquote>
Optionally you can point the BBCode Image setting to a 16x16 twitter.png image in your public/style_extra/bbcode_icons folder.
This works for me and I haven't found any problems resulting from these edits, however all edits are at your own risk.