Vines are amazing time wasters, and excellent forms of entertainment. The 6 second clips of comedy, special effects or every day life are fun to watch; and you'll probably want to share them with your friend occasionally. Unfortunately Internet Explorer on Windows Phone doesn't support playing Vines in the browser, meaning you're essentially sending your friends a pointless link. Fret not however as there is a fix!
To get Vine links to play on Windows Phone, you have to run them through a 3rd party app, 6sec to be specific. 6sec is needed since using a bit of trickery you can get Vine links that open in your browser to redirect into 6sec for viewing.
The first step is to add this simple line of code as a favorite in the browser:
Once saved as a favorite, you're practically done; anytime someone sends you a Vine link, open the link (it'll open in your browser); then head to your favorites and choose the Favorited code you just saved above; this should force 6sec open, and have it instantly direct you to the linked vine.
This might not be the most elegant solution, but it works; so if you're in the habit of sharing Vines with your friends then this is definitely worth it. Until WP get's a smart browser that can automatically redirect you to the relevant app (like it does with marketplace links) this is your best shot.