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1.
1. In SEO, content placed on a web site specifically for the purpose of enticing people to link to it.

2. (occasionally) Content that turned out accidentally to be link bait.
Your PR is zero. You need some link bait.
by Downstrike September 19, 2006
 
2.
A headline or title that attracts a high volume of online links. Applies particularly to bloggers hoping to land on the homepage of Digg or Reddit, or anyone hoping that their post will go viral on Twitter.
"Top 10" lists always make for great linkbait.
by Dona Francisquita March 22, 2010