There are many ways for websites to tap into online social networking services to allow their users to connect with each other. Now, for publishers who want to add social network functions to already existing websites, Yahoo! has announced their new Updates API, a web service that provides permission-based access to the actions of any user with a Yahoo! account. As part of Yahoo!'s Open Strategy (Y!OS), this API essentially allows developers to treat the Yahoo! network as a social networking platform (for more on Y!OS see our coverage of the initial Y!OS announcement and their YQL launch).
Location-based social game FourSquare no longer has limits to where it can be used. When users click on their city name below the header of the website, they see a search box to enter a new city. Previously the service supported about 100 cities worldwide and anyone who lived elsewhere was out of luck.