There's a huge security flaw in WINRAR, that will enable hackers to take over your computer. So Leo advises that if you use WINRAR to zip/unzip your files, that you should update to the latest beta version. But you have to go to the WINRAR site and manually download the update. There is no automatic update.
David wants to upload videos to Facebook, but the files are too big. How can he make them smaller? Leo says that all video is compressed, and it's just a matter of increasing the compression to make the file smaller to play back on the internet. He can use a codec to do that. He'll want to upload the best quality that Facebook will take. Here are Facebook's requirements.
Then, Leo recommends using Handbrake to do the compression.