Twitter is a service for friends, family, and coworkers to communicate and stay connected through the exchange of quick, frequent messages. People post Tweets, which may contain photos, videos, links and up to 140 characters of text. These messages are posted to your profile, sent to your followers, and are searchable on Twitter search.
A Tweet is any message posted to Twitter which may contain photos, videos, links and up to 140 characters of text. Click or tap the Tweet button to post the update to your profile.