You cannot force content to go viral but you can increase the chances of it doing so by promoting it in multiple online places and at different times of day, using relevant keywords, directly asking others to share it, linking from existing popular content, making it funny, having an internet-famous person share it, and hoping to get lucky.
Photo Credit: <a href="http://www.flickr.com/photos/53098051@N02/5887099054/">CEBImagery.com</a> via <a href="http://compfight.com">Compfight</a> <a href="https://creativecommons.org/licenses/by-nc/2.0/">cc</a>
Photo Credit: <a href="http://www.flickr.com/photos/53098051@N02/5887099054/">CEBImagery.com</a> via <a href="http://compfight.com">Compfight</a> <a href="https://creativecommons.org/licenses/by-nc/2.0/">cc</a>
Photo Credit: Maryann Bates
Photo Credit: <a href="http://www.flickr.com/photos/70606346@N00/3946004755/">kurichan+</a> via <a href="http://compfight.com">Compfight</a> <a href="https://creativecommons.org/licenses/by-nc-nd/2.0/">cc</a>
It’s been promoted by you in multiple places online.Photo Credit: <a href="http://www.flickr.com/photos/53114928@N02/12239196283/">MarcelaPalma</a> via <a href="http://compfight.com">Compfight</a> <a href="http://creativecommons.org/licenses/by-nc-sa/2.0/">cc</a>
Photo Credit: <a href="http://www.flickr.com/photos/23566085@N00/1504172052/">e³°°°</a> via <a href="http://compfight.com">Compfight</a> <a href="http://creativecommons.org/licenses/by-sa/2.0/">cc</a>
Photo Credit: <a href="http://www.flickr.com/photos/60263275@N00/4757004/">surrealmuse</a> via <a href="http://compfight.com">Compfight</a> <a href="http://creativecommons.org/licenses/by-nc-sa/2.0/">cc</a>
Photo Credit: <a href="http://www.flickr.com/photos/47691521@N07/5752191166/">opensourceway</a> via <a href="http://compfight.com">Compfight</a> <a href="http://creativecommons.org/licenses/by-sa/2.0/">cc</a>
Photo Credit: <a href="http://www.flickr.com/photos/95257089@N00/453210850/">HeyThereSpaceman.</a> via <a href="http://compfight.com">Compfight</a> <a href="http://creativecommons.org/licenses/by-nc-sa/2.0/">cc</a>