I currently teach 2nd grade. I use Pinterest frequently to find ideas for all subjects. I created various boards for general subjects as well as specific (e.g. dinosaurs) When I find links that I love, I pin them on the specified board. It helps to be able to return to find them quickly and keeps me organized. I really like, as a teacher, links that are common core related.
https://www.pinterest.com/pin/242561129907663461/