InstaPAL is now having Automatic Post Liking!!! - Like first, view later.
InstaPAL helps you to get notify when your favorite following users post new photos or video on Instagram. With new features you may also set auto like any new posts from the your favorite list of you are following.
* You must install Instagram App (https://play.google.com/store/apps/details?id=com.instagram.android) to view post & user's profile.
For quick usage, please refer to this link http://madet.my/2014/08/instagram-post-alerts-and-auto-like-for-android.