what are the APIs that support linkedin,twitter and facebook?

im trying to integrate linkedin,twitter and facebook into my app.Im facing so many problems.Headersearch paths,library paths are not fixed properly.I heard that there are some APIs which support linkedin,twitter and facebook.Can anyone suggest me what are 开发者_StackOverflowthe APIs which support all the three?I tried by using OAuth twitter package and OAuth consumer for limnkedin. But there is a build error : Buld Failed: Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1

I followed these github samples to integrate linkedin and twitter:

https://github.com/bengottlieb/Twitter-OAuth-iPhone https://github.com/ResultsDirect/LinkedIn-iPhone

Check this out.
Ref URL: http://getsharekit.com/
Hope this helps...