London Mayoral Election Map
The BBC have created a map for the London Mayoral election which allows users to predict who they think will win. Users set their location on the map, say who they are going to vote for and leave a comment.
The tag for each user is colour-coded depending on their chosen preference. It is therefore possible to get a fair idea of how the election might pan out just by looking at the map.
At the moment the map seems to be suggesting a lead for Boris Johnson (in blue) over Ken Livingstone (in red), which seems to be in line with what the pollsters are predicting.
The London Mayor election results are expected in about two hours from now, so we should soon be able to tell how accurate a prediction method a user-contributed Google election map can be.