Serial voting is the act of casting many successive upvotes or downvotes on the posts of a specific user.  Such voting is abusive and is automatically detected and reversed on a daily basis; users found voting serially may be [suspended][1].  For more information, see 

 * [What is serial voting and how does it affect me?](https://meta.stackexchange.com/q/126829)
 * https://math.meta.stackexchange.com/questions/3068/when-are-serial-downvotes-classified-as-anomalous-what-to-do-about-a-sequence-o
 * The [page on serial voting](https://math.stackexchange.com/help/serial-voting-reversed) in the help center.

  [1]: http://blog.stackoverflow.com/2009/04/a-day-in-the-penalty-box/