As with most BB Codes this should work on all versions of vBulletin including vBCloud.

Will embed tweets as you see here.

Log into your Admin CP go to Custom BB Codes on the side menu, expand it, and choose Add New Bb Code.

On the next page enter the following:

Title: Tweet
BB Code Tag Name: tweet
scription">PHP- Kodu:
<blockquote class="twitter-tweet" lang="en"><p lang="en" dir="ltr"><a href="{param}"></blockquote>
script async src="//" charset="utf-8"></script> 
Description: Embeds a Tweet
Use Option: No
Button Image: (Leave blank or find your own icon image)
Remove Tag If Empty: YES
All remaining Yes/No questions - also YES.

And save the BB Code.

Now in a post you can post something like

to embed a tweet.

You find the number by finding the link to the tweet on twitter and taking the number from the link.

For example the link to a tweet might be:
PHP- Kodu: 
So in this case use:

To embed the tweet.

Original Source: Embed Tweets from Twitter BB Code