Yes it includes punctuation.
No, Twitter's 140-character limit does not include punctuation. Punctuation marks such as periods, commas, and exclamation points are not counted as characters in a tweet.
Yes it includes URLs.
No it doesn't include your username. However, any usernames that you mention in your tweet are included in the 140 character limit.
The Instagram bio character limit is 150 characters - just 10 more than Twitter's tweet limit of 140! Choose your bio carefully!
The 140 Character Conference (#140conf) is a conference on Twitter and the real-time Internet. It's name refers to the 140 character limit of each tweet on Twitter.
Yes, the Twitter character limit includes spaces and other symbols. However, if you have a URL and that is what makes you go over the limit, Twitter will automatically shorten it for you.
A twoosh is a "perfect" update (or "tweet") on Twitter. Specifically, a twoosh is a tweet which uses every character of Twitter's 140-character limit, being exactly 140 characters in length.
You have to fit what you need to say into a specific character limit
There is not an limit
There are various apps available that allow you to do this. One such app is Twitlonger. However, whatever is after the 140 character mark will have to be accessed by clicking on a link.
You can't.
"Twitter jail" is when someone hits a limit imposed by Twitter (such as tweeting too much or sending a massive amount of DMs). The limit is there to prevent downtime and error pages.