Any system that ranks popularity undoubtedly can and will be gamed, it's as simple as that. This is how news outlets end up reporting ridiculous statistics or outrageously skewed public opinion polls. In 2013 it was estimated that between 5.5% and 11.5% of facebook's users were fake accounts, but their likes and votes are real. I'd hazard the guess, based on the shear volume of global propaganda perpetrated lately, that number is substantially larger today.