Ravsberg had long used earnings from his work as an accredited foreign journalist to support his popular blog “Cartas desde Cuba” (Letters from Cuba), where he writes critical commentary about public life and politics in Cuba, and where a single post regularly garners hundreds of comments from readers. 
Ravsberg kwa muda mrefu alitumia mapato aliyoyapata kutoka katika kazi yake kama mwandishi wa habari kutoka nje kuimarisha blogu yake mashuhuri inayojulikana kama “barua kutoka Cuba” (Cartas desde Cuba), ambapo huandika habari za kisiasa na maisha ya wananchi wa Cuba alizozifafanua vizuri, na mara nyingi akituma habari mara moja hupata maoni miamoja hivi kutoka kwa wasomaji.