Those are both tweets by Drew he just put the @ sign in front of Cry baby so he gets it direct to his twitter feed and Hashtags (#) is just like a file anything with the same hashtag will show up on the same page
@mention By placing the @ symbol in front of a username, you can tag another user in your Tweet.
@reply By starting your Tweet with @username, you can reply publicly to a single user.
Direct message (DM) A private message can be sent directly to a user on Twitter who is already following you.
Follower A follower is someone who follows you on Twitter and sees your updates on his home feed (Your home timeline displays a stream of Tweets from accounts you have chosen to follow on Twitter).
Retweet (RT) This is a way for someone to share a Tweet from another user's account.
Hashtag Using the # symbol in front of any word or phrase tags your Tweets. When someone clicks that hashtag, she sees your Tweet along with everyone else's Tweets using that same term.