Does marking an email as spam in Gmail affect the filter for everyone?

If I mark something as spam in Gmail, does that modify only my spam filter or does it affect the spam filter for other users?

Answer

Gmail users play an important role in keeping spammy messages out of millions of inboxes. When the Gmail community votes with their clicks to report a particular email as spam, our system quickly learns to start blocking similar messages. The more spam the community marks, the smarter our system becomes.

From here: http://www.google.com/mail/help/intl/en_GB/fightspam/spamexplained.html

Attribution
Source : Link , Question Author : Lazer , Answer Author : Daniel H

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