The number after the slash is the number of tweets from the same author.
A Tweetstorm lets readers know how many tweets to expect.
On the surface, this seems like a great idea, but it has gained some controversy.

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A series of tweets from one person, especially a lengthy series, may be viewed as spammy.
No one likes spam, and this could be an easy way to lose followers.
However, the occasional Tweetstorm has a place.
One case might be a newscaster tweeting about a tornado warning or a broadcaster live-tweeting the Puppy Bowl.
X is known for conveying small nuggets of information and short conversations.
It’s easy to see why the Tweetstorm used to be viewed as controversial and spammy.
Why Should I Tweetstorm?
This question is not so easily answered.
Do you rarely run out of your allotted 280 characters when tweeting?
If so, you may never need to do a Tweetstorm.
Do you edit most of your tweets to fit into X’s format?
Maybe this is for you.
As with most things, this is not necessarily an all-or-nothing approach.
How to Post a Tweetstorm
X facilitates Tweetstorms or serial Tweets.
you might compose a series of Tweets and publish the series all at once by selectingTweet All.
FAQ
Use Tweetsmaps to schedule X threads.
Compose your tweets and selectPowerSchedule.
Some otherX client toolsoffer a similar feature.
Go to the tweet and select theShareicon (the box with anup-arrow).
Then, in the pop-up menu, selectCopy link to Tweetto copy the URL to your clipboard.