Ok, so you have deleted the apps responsible for the spam. If you haven’t yet; do that first. Now you still need to clean your account history of all the fake likes.
How to clean your account history: step by step.
- Go to your like history
- Now search for Snapchat (and maybe 9GAG/Whatsapp/…). You can use the Facebook “Activity Search” but I don’t recommend that. Your browser’s search is much better.
- To use it you need to scroll a lot so a lot of your like activity gets loaded on to the page. Now press Ctrl+F (or Cmd+F for the Mac users) and type Snapchat.
- Now every time you press Enter you browsers will take you to the next like and you can remove it.
- When you’re at the end you may have to scroll more to load more activity and repeat your search to get all the fake likes.
Help, my Facebook account is liking fake Snapchat (and other) pages! 
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