Coexister has 19 active chapters in France, Belgium and Switzerland, running an innovative slate of outreach programs. Samuel’s impact as an opinion leader is bolstered by his mastery of new media. Coexister’s members were omnipresent on social media during and after the attacks in Paris last year, and their hashtag #NousSommesUnis (we are united) was the most retweeted of any French hashtag following the attacks.