Hey influencers - which social media site is your favorite for posting sponsored content?

Is there one platform that makes it super easy to post and mark content as sponsored? Or are there any shortcuts you use to make this process easier?

Michael Quoc Agreed, Instagram is a great platform these days!
Sara Howard Instagram.
@FitFoodTravelUK Instagram!
Thati Segoatle Facebook and Instagram
James Wallington Instagram!
Sathya Narayanan followed 2 new interests