As with tags on Flickr or Delicious, hashtags on ____ add additional context and metadata to your tweets.

Name: As with tags on Flickr or Delicious, hashtags on ____ add additional context and metadata to your tweets.
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Question

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Hashtags are primarily used on Twitter to add context and metadata to tweets, similar to how tags are used on platforms like Flickr or Delicious.

As with Tags on Flickr or Delicious, Hashtags on ____