[Q] Google Play Services...

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http://forum.xda-developers.com – few days ago i've seen that Google Play Services app runs in background and eats a battery (not much, but still)... so i freezed it with Titanium... some/they say that Google Play Services is required on the phone, but i don't see any change without it (Google Play works, apps can be updated via store, Gmail app works, etc...) when i run the Youtube app - it shows a popup message that Play Services must be enabled > jumps to settings/apps/play services > i just closed that and Youtube is working without a problem... so my question is - why it is needed at all? (HowTos)