Go here:
https://twitter.com/search?f=images&... nts&src=typd
Type in the search bar anything like #rippedmypants, #splitpants, split my pants, ripped my skirt etc get creative. When the search results for tweets come up, click on the photos link then when you find one you like click on the pic then when it pops up then click on the link that shows the date the post was made (it's just under the pic itself). Then when that pic pops up right click and save as.
For instagram you have to download the app then search using hashtags, i.e #rippedpants and then copy the url link to your phone and go here to download from instagram.
http://www.dinsta.com/
Paste the url in the box and click download, then when it's done click on the pic to open it up and right click to save. You can also go here if you don't have the app.
https://www.instagram.com/explore/tags/rippedmypants/
You will still need to copy ever pics url and use dinsta to download it. I hope that helps