by @jasdev
JDSActivityViewController is a lightweight UIActivityViewController subclass, which can be configured to display a URL to be shared. This was inspired by Tweetbot and Tumblr's usage of this customization.
pod 'JDSActivityVC'
import JDSActivityVC
/* Inside of a UIViewController */
let imageURL = NSURL(string: "http://i.imgur.com/aJYZ20v.gif")!
// Normal UIActivityViewController initializer
let sampleActivityViewController = JDSActivityViewController(activityItems: ["Two Dogs", imageURL], applicationActivities: nil)
// Set display URL
sampleActivityViewController.link = imageURL
presentViewController(sampleActivityViewController, animated: true, completion: nil)