Tracking issue for apps where content filtering is problematic

This task is a tracking issue where we list apps where content filtering is problematic.

While discussing these issues we may realize that some improvements to AdGuard itself are required. This is why this tracking issue is created in the first place, we need it to figure out what new solutions there are. Also, in the future we can label these apps in AdGuard interface so that the users could understand what's wrong with them.

Most of the apps require root to make content filtering work. In this case we'll ask @AdguardTeam/filters-maintainers to see if the issue can be at least resolved on rooted devices.

Resolving issues with such apps is very hard and time-consuming so at first we will only address issues with the most popular apps (100M installs and more). Other apps can be listed here, but they'll be resolved only when we have enough time to do that.

Please submit new apps in the comments.

| App | Geo | Can be solved with root? | Filtering rules | Alternative solution |
|--------|--------|--------|--------|--------|
| [Youtube][youtube] | Global | We're looking into it in [CoreLibs](https://github.com/AdguardTeam/CoreLibs/issues/1778) | None | Use Youtube in the browser or use alternative apps: Vanced (Re-Vanced?), NewPipe |
| [Facebook][facebook] | Global | Uses TLS-pinning so root is not enough | None | Use Facebook in the browser |
| [Twitter][twitter] | Global | Uses TLS-pinning so root is not enough | None | Use Twitter in the browser |
| [Spotify][spotify] | Global | Maybe | Need assistance from @AdguardTeam/filters-maintainers | ? |
| [Messenger][messenger] provided by Facebook | Global | Probably the same as for Facebook app | ? | Use Facebook in the browser |
| [LINE][line] | JP | ? | Need assistance from @AdguardTeam/filters-maintainers | ?
| [Snapchat][snapchat] | Global | ? | ? | ?

[youtube]: https://play.google.com/store/apps/details?id=com.google.android.youtube&hl=en
[facebook]: https://play.google.com/store/apps/details?id=com.facebook.katana&hl=en
[twitter]: https://play.google.com/store/apps/details?id=com.twitter.android
[spotify]: https://play.google.com/store/apps/details?id=com.spotify.music
[messenger]: https://play.google.com/store/apps/details?id=com.facebook.orca
[line]: https://play.google.com/store/apps/details?id=jp.naver.line.android
[snapchat]: https://play.google.com/store/apps/details?id=com.snapchat.android