A hashtag is any word or phrase immediately preceded by the # symbol. When you click or tap on a hashtag, you’ll see other Tweets containing the same keyword or topic.
The @ sign is used to call out usernames in Tweets: “Hello @twitter!” People will use your @username to mention you in Tweets, send you a message or link to your profile.
A username is how you’re identified on Twitter, and is always preceded immediately by the @ symbol. For instance, Twitter Support is @TwitterSupport.
Twitter Alerts enable public safety agencies to inform people during emergencies by highlighting critical time-sensitive content with notifications and a unique look.
Your bio is a short (up to 160 characters) personal description that appears in your profile that serves to characterize your persona on Twitter.
If you block a Twitter account, that account will be unable to follow you or add you to their Twitter lists, and you will not receive a notification if they mention you in a Tweet.
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A cashtag is a company ticker symbol preceded by the U.S. dollar sign, e.g. $TWTR. When you click on a cashtag, you’ll see other Tweets mentioning that same ticker symbol.
A personalized experience providing a fast and easy way to connect you to accounts you may be interested in, or to reconnect you with old friends on Twitter through your device’s address book. Read more about the Connect tab.
If you deactivate your account, it goes into a queue for permanent deletion from Twitter in 30 days. You may reactivate your account within the 30 day grace period.