Putting # in front of a word in your tweet such as Xbox or nextgenupdate will show people your tweet if they search for #xbox or #nextgenupdate. It's just to help people find other people who are talking about the same things. It also helps it become a trending topic, so if a ton of people all of a sudden start tweeting #nextgenupdate it will show up in the trending topics and everyone who tweeted #nextgenupdate would have their post viewable to people who searched for that specific hashtag.
You can find a list of popular hastags at
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