Kaepernick motivated by Twitter

Updated: September 25, 2013, 12:17 PM ET
By Bill Williamson | ESPN.com

SANTA CLARA, Calif. -- After two straight poor offensive showings by the San Francisco 49ers, quarterback Colin Kaepernick is starting to hear -- and see -- criticism.

Celebrated after leading the 49ers to a Super Bowl berth after his first 10 starts in the NFL, Kaepernick is getting heat, as San Francisco has scored a combined 10 points in losing the past two games.

Kaepernick has been hearing criticism especially on Twitter. Many of the tweets directed at Kaepernick he ...

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