Twitter announced last week that they would be making several changes to their API that allows developer to creat applications like TweetBot, Instapaper, and Timehop. These changes are controversial because Twitter’s growth is largely attributable to the geekier-developers that created clients and applications that gave the social network the user experience that made it palatable. Wider adoption happened not through the SMS (texting) interface that Twitter launched with, but through apps and tools for smartphones and other social networks.
Google is encouraging content creators to organize social connections between their own sites and the sites of their friends, co-workers and other associates using a Social Graph. This hierarchy is executed using the XFN standard. This standard allows content creators to simultaneously link and classify connections between their content and other locations on the web.