Hey folks, my friend uses this app called Timehop which periodically posts these little puzzles, and I thought some of you would find them fun to complete. Here's the link: https://www.timehop.com/puzzleparty

So far I've solved #1 and #3 (answers in the comments) and I'm working through #4. #2 has eluded me so far but I'm hoping I'll figure it out eventually.