The newest site that  I  have  found is called Influenster.  This is a great way to get free samples!  The more you share  on social media  the more points you earn and you can get a box of goodies. This was the last box that I received. 

Best things are free from @Influenster! ‪#‎Rimmel‬ ‪#‎GetADVANCED‬ ‪#‎SugarPlum‬ ‪#‎CelestialTea‬ ‪#‎LoveMyEcoHairBrush‬ ‪#‎McCormickGourmet‬ ‪#‎SweetSide

The more you connect your accounts, the higher your impact score gets.