Contentos just concluded their PhotoGrid Brazil-exclusive rewards campaign, they got massive response to this campaign where huge number of users participated. It was exclusive in-app event in Brazil, where they offered 300K COS tokens. Top contestnt was @Laaizab who earned more than 15K COS tokens.
Price movement of the tokens tells how successful this event was. COS price jumped more than 100% within a days after the completion of this event.
Unfortunatly I missed this event, but I hope Contentos team will be coming up with such events in coming days.
You can check below link, if you wish to know more about this event and want to know their Contentos future plans.