how can anyone tell which protest is the official and which one is not? 
Simple - none of them are.
of·fi·cial (ə-fĭsh'əl)
adj.
1. Of or relating to an office or a post of authority: official duties.
2. Authorized by a proper authority; authoritative: official permission.
3. Holding office or serving in a public capacity: an official representative.
4. Characteristic of or befitting a person of authority; formal: an official banquet.
Simple - none of them are.
of·fi·cial (ə-fĭsh'əl)
adj.
1. Of or relating to an office or a post of authority: official duties.
2. Authorized by a proper authority; authoritative: official permission.
3. Holding office or serving in a public capacity: an official representative.
4. Characteristic of or befitting a person of authority; formal: an official banquet.