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More information on the measure is available at
http://happyflu.com

Please read this carefully before using the data
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BASICS
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  hf_activity contains information about the activity on the
  diffusion tree.
  Each row represents a hit, fields are pipe (|) separated.

FIELDS
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  0. uid (int)
    unique identifier of the hitted node
  1. vid (int)
    unique idenfifier of the visitor
  2. referer (str)
    HTTP referer of the visit
  3. time (unix timestamp)
    date of the visit