Here, I would like to mention my most favorite websites
1) https://flipkart.com
2) https://amazon.com
3) https://ebay.in(Now its https://ebay.com since Aug 14, 2018)
4) https://shopclues.com
5) https://mouthshut.com
6) Facebook.com
7) Instagram.com
8) LinkedIn.com
9) Scholar.google.com
10) researchgate.com