Because Alyssa knows a lot about social media, she knows that Marcie is "posting a message on Twitter."
Twitter is an online news and person to person communication benefit on which clients post and interface with messages known as "tweets". Tweets were initially confined to 140 characters, yet on November 7, 2017, this farthest point was multiplied for all dialects with the exception of Japanese, Korean, and Chinese. Registered clients can post tweets, yet the individuals who are unregistered can just read them. Clients get to Twitter through its site interface, through Short Message Service (SMS) or cell phone application programming ("app")