Swift, post to FaceBook and Twitter

ViewController.swift

import UIKit
import Social
import MessageUI

class ViewController: UIViewController, MFMessageComposeViewControllerDelegate {
    
    // MARK: Social
    
    func postToFaceBook() {
        let vc = SLComposeViewController(forServiceType: SLServiceTypeFacebook)
        vc.setInitialText("Posting to FaceBook")
        // vc.addImage(UIImage!) // Add an image
        // vc.addURL(NSURL!) // Add a URL
        presentViewController(vc, animated: true, completion: nil)
    }

    func postToTwitter() {
        let vc = SLComposeViewController(forServiceType: SLServiceTypeTwitter)
        vc.setInitialText("Posting to Twitter")
        // vc.addImage(UIImage!) // Add an image
        // vc.addURL(NSURL!) // Add a URL
        presentViewController(vc, animated: true, completion: nil)
    }
    
    func sendMessage() {
        let messageVC = MFMessageComposeViewController()
        messageVC.body = "Your message string"
        messageVC.recipients = []
        messageVC.messageComposeDelegate = self
        
        presentViewController(messageVC, animated: true, completion: nil)
    }
    
    func messageComposeViewController(_ controller: MFMessageComposeViewController,
              didFinishWithResult result: MessageComposeResult) {
              // Do something after sending a message...
            }
}