20 Million Geotagged Photos

With now the barrier of 20 Million geotagged photos reached, Flickr is arguably the richest publicly accessible massive source of user-disclosed spatio-temporal data.

Relation to my thesis: I am observing emerging mobile/web-based LBS such as Plazes, Jaiku, Twitter, Dopplr to collect spatio-temporal data for my current exploratory work. Yet, so far Flickr proved to be the most promising dataset.