The Votizen API aims to get friends to involve their friends in supporting candidates. The API website notes that the API is entirely based on HTTP. Votizen is based on the premise that, "Voters are more likely to listen to friends than campaign volunteers." Votizen is the first "social campaigning platform built entirely on personal connections."
Twitter added its own photo upload feature, after years of clients adding photos via APIs such as the TwitPic API. The new feature will be slowly rolled out on Twitter.com to all users. It is also expected to be incorporated into Twitter's official apps, as well as the Twitter API, upon which Twitter builds all of its end-user services.