Here is your answer..
"we will contact the participants through their social media accounts used to join the campaign. Make sure you have this option allowed in your profile settings to be able to receive further instructions on how to claim your reward. - See more at: https://decent.ch/en/decent-ico-bounties-update-rules/#sthash.1iOz8oCU.dpuf "
"this option" meaning what?
Twitter allows (afaik) to receive direct messages from the "people you follow".
I think that Facebook has something similar.
But I think that each one of those in "social media" campaigns are also present in the e-mail campaign and DECENT will inform everybody more exactly when the time will come.
"Third quarter of 2017" is still far.