Aries: Snap chat

Taurus: Twitter

Gemini: Flickr 

Cancer: Wattpad (XD It can count since it does connect people across the world)

Leo: Facebook

Virgo: Vine

Libra: Youtube

Scorpio: Tinder

Sagittarius: Instagram 

Capricorn: Tumbler

Aquarius: Pinterest

Pisces: Devianart