Then you could see waves of local interest, as the daytime tourist hordes give way to drunk people snapping party pictures. To see the entire series, check out Fischer’s Flickr .

Flickr added third-party login support more than three years ago in an effort to boost the site's user base but that was before Marissa Mayer took over as Yahoo CEO.

Twitter and Flickr tags again fail to overlap. In these three cities, it’s clearly not an issue of how much penetration each service has: They’re both really popular.

The move to only post a handful of selected images on the Conservative Party's official Flickr account has fuelled accusations the Tory leader is "dodging" scrutiny.