Identify these social media channels

Which is the globally top ranking online networking website?

Which platform is a "Live video streaming mobile app owned by Twitter"?

What's the name of the online platform for organising & sharing pictures/items of interest?

Identify which one of the following platforms is NOT for sharing videos

Which fast moving social network has a maximum 140 character limit for all posts?

Name the mobile based social app that has restraints on how long the content remains visible

Can you identify who this logo belongs to?

Name the largest global business & professional networking site that creates business contacts?

Which popular photo sharing platform has just released this new logo?

Which social media platform uses this logo?