Getting updated variable outside IBAction swift

I am having a hard time, finding out how to get the updates

so that I can put an image in my imageview in the cell. As you can see in the code I have made an instance with the var facebookProfileUrl at the top of my page. At the bottom of the code, you can see that if facebookProfileUrl is empty, it will say so - and that's what this code is doing. Even though I am changing facebookProfileUrl in the middle of the code, nothing happens. What can I do to fix this?

var facebookProfileUrl = "" // THIS IS BEFORE viewDidLoad







@IBAction func addToFeed(sender: AnyObject) {

    let accessToken = FBSDKAccessToken.currentAccessToken()

    if(accessToken != nil) //should be != nil

    {

        let req = FBSDKGraphRequest(graphPath: "me", parameters: ["fields":"id"], tokenString: accessToken.tokenString, version: nil, HTTPMethod: "GET")

        req.startWithCompletionHandler({ (connection, result, error : NSError!) -> Void in

            if(error == nil)

            {

                let userId: String? = result.valueForKey("id") as? String

                let userID = userId

                self.facebookProfileUrl = "http://graph.facebook.com/\(userID)/picture?type=large" // HERE I AM CHANGING THE VARIABLE



                let feed = Sweet(content: feedContent, addedByUser: name!, profilePhoto: self.facebookProfileUrl)

                let feedRef = self.dbRef.child(feedContent.lowercaseString)



                feedRef.setValue(feed.toAnyObject())



            }

            else

            {

                print("error \(error)")

            }

        })

    }

}











override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell:updateTableViewCell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! updateTableViewCell





    let update = updates[indexPath.row]





    cell.nameLabel.text = update.addedByUser

    cell.updateLabel.text = update.content





    if (facebookProfileUrl != "") {

        if let url = NSURL(string: facebookProfileUrl) {

            if let data = NSData(contentsOfURL: url) {

                cell.picView.image = UIImage(data: data)

            }

        }

    } else {

        print("Empty facebookProfileUrl") // THIS ONE IS PRINTED

    }







    return cell

}