#p4aProject for Awesome is a YouTube charity promotion that takes place Dec. 17. They're currently having a livestream event.
#showurIDPeople are tweeting situations in which an ID check is necessary. The hashtag was started by @affioncrockett regarding girls who pretend to be older than they are.
GoodnightOften trends when people sign off and head to bed.
Use an at-sign (@) immediately before a username to find mentions of (and replies to) a user. Example: @mashable will find tweets referencing the user "mashable".
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