The site displays foursquare venues , tweets and facebook checkins based on the current map view or search parameters.
To get started, move the map and hit 'Search near here!' to update the displayed foursquare venues and fetch a list of nearby tweets. Tweets that have an explicit location marked will be shown on the map. Click the markers on the map to show more details, or click 'Show on map' to display a specific tweet.
The 'Centre on me' button, like the name suggests, will centre the map on the location currently reported by your browser. This will normally result in you being prompted to share your location with the website - click yes/allow to let the magic happen. Answering in the negative will leave the map where it is