Videoder supports downloading from facebook and instagram sites as well as from their respective apps. You can find the guide on how to download using app here.
'Our developers keep adding on new websites almost every week as per the request of our users. Just mail us anytime you have a suggestion for us.
Videoder is an all in one downloader for downloading music and videos from over 20 different sites and apps with new ones being added weekly. Go grab this awesome app now.
We just say you to try it once. Its free. And we bet you won't regret your decision.