Yahoo Developer App (Oauth) - Can't Access Contacts Through Yahoo App? - oauth-2.0

I'm integrated with the "Yahoo Developer (Oauth)" to allow my customers to login to their Yahoo email accounts and then be able to invite friends from their contact list. This used to work properly but now when I try to login in, I just see a blank page from Yahoo.
https://developer.yahoo.com/oauth2/guide/openid_connect/getting_started.html#getting-started-setup
I followed the above steps and have the correct client IDs but it's still now working properly, does anyone have experience with working with this?
I tried looking for a Yahoo Developer contact information or support forum but I can't seem to find any.
Thank you!

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Review Said "Instagram profile permission(s) should not be used to authenticate new users in your app."

Okay, So I have seen multiple issues(answered and unanswered) regarding Instagram API, haven't found anything related to my problem.
I have made an app in iOS which lets users download only profile pictures of any Instagram user in HD resolution.
After a long struggle, I have found all of the related API's And I am able to get the HD variant of Profile pictures in the app. Now the thing is those APIs read the phone's browser cookies that if I have authenticated the user in Instagram or not. And if I don't authenticate before the HD profile query id doesn't give me the desired data i.e no HD profile Url.
It means that I can only get the Instagram authentication before letting my users search and query for the HD profile pictures. So I figured out and added that using Instagram Basic Display API.
The problem came when I submitted the app for the Facebook developer review. They keep saying that Instagram profile permission(s) should not be used to authenticate new users in your app.
And it's the 3rd time I told them that the app flow requires the authentication just to read cookies and I am not using any of the user's data for personal authentication, but they are not letting the app pass the review.
My need is can someone help me out if I am really using the wrong authentication process or maybe I am not able to convey my need to the reviewer. So what do I tell them, I am sure there is something going on wrong because I have seen some apps doing the same process in their apps.
Thanks for helping me out

LinkedIn company feed/updates in v2 API

I would like to show a company's feed/updates/post on a website. I am the owner/admin of the LinkedIn page. Most of the related questions are old and uses V1. This similar questions also seems unanswered (LinkedIn Company Feed in API v2?). LinkedIn support are of no help and they instruct me to ask questions on Stackoverflow.
I created an App on LinkedIn and they assigned default permissions (r_emailaddress, r_liteprofile, w_member_social). But these permissions are of no use to me since I just want to show the company feeds on the website. Neither I want any user to login to LinkedIn nor I want to read the users/visitors email addresses or profile. Already went through a lot of their documentation but there is no clear mentioning of how to do this.
I read that company updates can be retrieved using the /ugcPosts API. GET https://api.linkedin.com/v2/ugcPosts?q=authors&authors=List(url-encoded organization Urn). But in order to do that I need r_organization_social permission. How to get this permission?
Also in this scenario, since I just want to retrieve company posts, I can use 2 legged oauth: https://learn.microsoft.com/en-us/linkedin/shared/authentication/client-credentials-flow?context=linkedin/context instead of 3 legged oauth. But when I try to generate access token I get error "access_denied: This application is not allowed to create application tokens"
https://www.linkedin.com/oauth/v2/accessToken?grant_type=client_credentials&client_id=xxxxx&client_secret=xxxxx&redirect_uri=http://xxxxx.local/&state=fasdfasdfs
Does anyone know how to achieve this?
Thanks!
You need to apply for the LinkedIn Marketing Partner Program. You can do so by adding this product to the app you have created.
Once you have access, you can read the company feed using the following API endpoint:
https://api.linkedin.com/v2/shares?q=owners&owners=urn:li:organization:12345&sharesPerOwner=100&count=25
Hope this helps.

Subscribe users to my twitter account

I have some problem with twitter integration in my website.
You can see some information below:
I created Twitter app in my account and users authorize my app. Can I automatically subscribe these users to me? I tried to read Twitter API but I didn't find solution for my problem.
Could you help me?

Using google plus API is it possible to fetch gmail contacts

In my application I want to fetch my gmail contacts.
In my app I have already integrated "Google+ API" So i just need to know that can i access my gmail contact by using the same API. Or I need to integrate Gmail API.
Please help me I am new to this
I wouldn't imagine how you would get the contacts from one service by using another? Not everyone in your gmail contacts is going to be on your google+ account, so how would it be possible to get them?
There are other ways and it is documented online how to integrate with gmail, I suggest you research links like the following to find something you need:
gmail integration in ios application
Gmail API for objective-c?
how to fetch my Gmail contacts into my iPhone App
It is possible, but only if you ask for the contacts scope alongside your Google+ scopes.
Where you integrate the Google+ API, you will also need to ask for scope https://www.google.com/m8/feeds.
See https://developers.google.com/google-apps/contacts/v3/ for more details.

Retrieve facebook data in backend service

I'm currently working on an app (iOS 6) where the user will be signing in using their facebook account.
In regards to this I have a few questions:
a) Since the app asks the user for permission to access cetain data (like: basic profile info, friend list, access to post to wall etc), I assume that the app based on it's app id will be somehow authenticated to access this information as long as the user doesn't restrict access through their facebook account.
b) will it be possible for example via a service application to authenticate with the same app id as the mobile app, and hence be able to collect data from the facebook users who authenticated with the app?
The purpose of my question is, that I would like do some analysis on the users using the iphone app, but I don't want the app to first download the information from facebook, and then pass it on to my service for analysis.
If the above is possible, could anyone please guide me in the direction of what it is that I need to do? Perhaps links to tutorials that describes this setup, og simply tell me the right facebook terminology that I'm looking for to achive this.
Thanks in advance!
It's a bit late and you may have already picked a service. I have been using Parse.com
(tutorial site). They're very good. They have SDKs and sample code for many platforms a RESTful service for others.
They have recently been acquired by FaceBook, and already have strong links to Facebook's SDK.

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