Since online polls began, they have been useless for anything that matters. It's not just a self-selection issue. It's that people who are obsessed with this crap will vote multiple times, build bots that vote, and get all their friends -- many of whom may have no interest in the matter -- to vote. Or, as I like to say, every time a major news org has some sort of poll about Israel or Palestinians more people vote than live on the planet.
Anyone who wants to vote should go right ahead. I waste my time looking at pictures of kitties with funny captions, so who am I to criticize others. But when I see people pretending these results mean something, I will raise a metaphorical arched eye brow. Bluntly, your vote for this year's Pegasus Awards has more real world meaning than the PBS survey on Sarah Palin.