The episode in general was alright. I didn't think it was anything special, but it had that heartwarming feel that Lisa episodes tend to do best. It maybe because I find Lisa and Nelson's little romantic moments to be adorable (I tend to like the opposite attract pairing).
I thought the gag at the end dragged on, but it immediately redeemed itself with the Facebook joke which just made it funnier for some reason. Also, nice points on the Up parody - even using the actual score from the movie.