Twitter, in common with other social networking sites and services, has an authentication system. In Twitter’s case it’s called OAuth and it allows you, as a user, to give applications and service access to your account. For an application or…
Foursquare allows you to post and share your location. Depending on where you are and how adventurous the businesses are in the area, you might get the odd discount or special offer for doing so .. But there is a…
