Pinterest is probably my most used social media platform. I find it very helpful for getting quick activities or to find resources that I might not be able to come up with myself. Here are some boards I follow and get a lot of good preschool activities from!
https://www.pinterest.com/educatorsspinon/playful-preschool/https://www.pinterest.com/myonlysun/invitation-to-play/https://www.pinterest.com/pocketpreschool/preschool-math/