Another idea for a bounty is this:
Since we will have traffic from other social networks (mainly Facebook, Twitter and LinkedIn), why not to have a URL referral detection system that trigger a lightbox for let's say for people visting from Facebook saying something like this: Hey Facebook visitor! Have Facebook rewarded you for something you posted there or for even a like you gave?
And something similar for visitors from other popular sites.

Also this referral detection system could reward the poster of the original post which was shared on Facebook or Twitter, and/or the sharer of this content. The reward could be given after a visit or after a successful signup in Steemit.