软件概览
OWActivityViewController 是 REActivityViewController 的改进版，无需依赖第三方库，只支持 iOS 集成的社交网络 (for iOS 6: Twitter/Facebook/SinaWeibo, for iOS 5: Twitter).
而 REActivityViewController 依赖:
- AFNetworking ~> 1.1
- Facebook-iOS-SDK ~> 3.2
- DEFacebookComposeViewController ~> 1.0.0
- REComposeViewController ~> 2.0
- PocketAPI ~> 1.0.2
- SFHFKeychainUtils ~> 0.0.1
- AFXAuthClient ~> 1.0.5