Not that you're asking for a code review but a couple things I noticed:
- You left your twitter IDs in your code. Not sure if it matters to you or not.
- Your buttons probably have some stuff in common (corner radius at least), so consider making the them all inherit from the base LoginButton class.
- You can put multiple lets on a single line, like `if let accessToken = AccessToken.current, let facebookAPIManager = FacebookAPIManager(accessToken: accessToken) {`
- You left your twitter IDs in your code. Not sure if it matters to you or not.
- Your buttons probably have some stuff in common (corner radius at least), so consider making the them all inherit from the base LoginButton class.
- You can put multiple lets on a single line, like `if let accessToken = AccessToken.current, let facebookAPIManager = FacebookAPIManager(accessToken: accessToken) {`