do I have to handle both google+ API and google play game service to use google play game service? - google-play-services

I'm new to Android and trying to use google play game service for my app.
I found out from Google Developers page that there is a sign in guide in google play game service, but heard that i need to sign in with google+ account to use play game services.
So, my question is "do I need google+ account and also have to develop google+ API on my app to use google play game service?
Sorry my question is pretty messy, though I need help!
Thank you.

Play Games services features that use authenticated calls, such as posting high scores or joining a real-time multiplayer match, use Google+ sign-in. You will need to implement sign-in in your app; check out the docs at:
https://developers.google.com/games/services/android/init
You can have your game activity extend BaseGameActivity from the sample code and it will do a lots of the work for you.
Usually people refer to the "Google+ API" as the APIs for retrieving social information, like a getting a list of Google+ posts or sharing interactive posts on Google+. The sign-in is the same (it's obviously also using Google+ sign-in), but to use the Google+ API, you would also need to request additional scopes. See:
https://developers.google.com/+/mobile/android/getting-started

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How to get the list of most followed twitter users

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Any insights on this will be helpful.
There is no API for this. You would need to take an opinionated view of the high-volume celebrity accounts, and then watch the accounts by polling the user endpoints regularly. You could also use the commercial streaming APIs to watch the most Tweeted accounts and check the user objects on a regular basis.
(note that this is the same answer you were provided on the Twitter developer forums)

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I've seen some Instagram likers and other tools like follow unfollow apps, login and get access to an instagram account without redirecting to instagram's website.
I mean they have their own custom form built and they ask us to login with our instagram innit.
How do they do that? Does Instagram API allow that? And how do they beat the limit? I heard that instagram has an API limit of Max 5000 calls per day and 2000 follows. But they follow like a ton of people in the same website. How'd they do it?
Below are some examples of Instagram logins that I've used my fake accounts with (I'm sure nobody wanna get their accounts hacked)
They are not using the official but the internal instagram API. This means that they simulate an android or iOS device and login with your credentials so instagram thinks you are logged in from a mobile device. This gives you access to all instagram features (like, follow, upload photo and video and etc)! There are a lot of unofficial instagram APIs on github that do exactly this.
They also use a proxy for each account so they stay beyond the rate limits and don't get flagged.

How do sites like Instagress bypass Instagram's API?

I just discovered Instagress.com, and noticed that they ask you for your Instagram username and password to automate certain activity such as likes, comments, follows, etc. on your IG account. However they do this without using IG's official API since their service is obviously against IG's TOS.
So I'm wondering, how are they technically able to do this? I was thinking they use something like Selenium, but this only automates web browsers and (for all I know) it's impossible to perform those interaction through Instagram's web interface.
Any ideas?
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the instagram web access can allow you like, comment and follow and unfollow

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I've looked through the google+ API documentation and had a hunt for any other APIs, but I can't immediately see a way to do this via the google+ API (or even on the google+ website or main google website) - does anyone know if it's possible?
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