Colin Kaepernick is under social-media fire, apparently to his motivational delight, after enduring back-to-back losses for the first time as the 49ers starting quarterback. Kaepernick has "favorited" bitter Tweets condemning his struggles after blowout losses to the Seattle Seahawks and Indianapolis Colts. That bulletin-board, er, Twitter-post material – as first noted by NFL.com's Dan Hanzus [...]