These APIs are available to any network implemented on top of the PeopleAggregator platform. See peopleaggregator.net for an example. From their site: PeopleAggregator brings social web features to existing software or provides a stand alone social network of your own. We've got source code available or we can build you a SaaS system to your specifications.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.