It's those weekly facebook contests for kids "today we offer 100 tokens to 10 people who guess the correct answer"... like guess where's the ball going in the picture and then you have like 100 000 replies with 90 000 correct answers and they'll pick 10... lol... Chances you get the offer are ridiculous.
Do not bother replying, those "contests" are another way they have to make money through facebook clicks.
About the videos to earn tokens, I have seen 2 or 3 offers in 8 months, only one worked and it was like 1 token.
Most of regular offers are obscure things like buying jewelry in web shops, plane tickets, and filling enquiries with personal data for obscure sites that reply "we don't have any offer for you at this moment" after keeping your data for god knows what purpose, of course.