Social media etiquette - dos and don'ts at a wedding

Wondering whether or not its ok to take photos and post them on social media at a wedding?  Here's our thoughts on the subject.

1. Ask permission - Ask the bride or groom if they are happy with you posting photos on social media.  
2. An official hashtag # - Often couples create a hashtag for the day, guests can then upload them to instagram and they will all be filed in the same place.
3. Wait until the bride has posted - Dont steal the limelight and post a photo before the bride, this is just rude.