If you've got an iPhone 5s, you have the ability to record slow motion video due to the 5s' ability to record at up to 120 frames per second. For the most part, you record a slow motion video in the same way you would a regular video. You just need to make sure you're in the right recording mode.
You can then share it with anyone you'd like or share it to services such as Facebook, Twitter, Instagram, and more.
That's all there is to it. You're now ready to share your slow motion video.
Some users are reporting that when they upload slow motion videos to certain services, the slow motion portion is not carrying over. This will be an issue for one of two reasons, either the service doesn't support 120 FPS or you are not selecting to upload the HD version. With Facebook, use the native upload built into your iPhone 5s via the Photos app share option instead of the official app. This way you can change the default setting to HD. You can do this with YouTube natively as well.
With services like Facebook and YouTube, be sure to select the highest quality option you can. As long as you do, you shouldn't have a problem with either of them playing the slow motion portions.
Services like Instagram require a little trickery in order to get a slow motion video to upload correctly. As a workaround with services that either don't have a high def option or don't recognize slow motion natively, email the clip to yourself first using the sharing steps above. Once you've done that, just save the emailed attachment in your Camera Roll. The new clip should be work on Instagram and other services that don't recognize the native slow motion your iPhone stores.
It's not the prettiest workaround in the world but it does seem to work. If you've found another trick, let us know!
If you're still running into issues with slow motion videos, make sure to let us know what kind of problems you're having either in the comments below or in the iMore forums. Did any of the above options work for you? Let us know!