Database for Real Time Queries/Push Notifications - ios

I am looking to build an iOS app and website that work 'together'.
What the plan is for each:
On the iOS side, it will be pushing information to the server in the form of a post. The users will then be able to vote up and down on the posts as well; which also implies they will be able to see the other users information (in real time).
The website will be viewing this information in real time and using the posts. If a post gets enough down votes the server should tell the website and apps to remove it.
I have experience with SQL. Although SQL does not seem to be the appropriate server choice - for what I want to do - given my experience with it. (I could definitely be wrong.)
I would like to host the information myself, however have heard that Parse is good about holding information for iOS apps. I just don't know whether it gives you enough freedom to work with websites as well.
TL;DR: What kind of database/datastore should I use for a real time queries that allows for push notifications?
All suggestions are welcome. Thank you.

Try Using FireBase
firebase.google.com
Documentation

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As far as I understand, CloudKit will be OK for you. You can have a look at NSHipster's excellent summary here.
You also have a link to a tutorial in the comments above. If you want to discuss it further, don't hesitate to contact me through chat.

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Google has provided a mobile backend starter some time ago, here is the link https://developers.google.com/cloud/samples/mbs/. Hope it will help!
Yes you have. Kindly look into DynamoDB from amazon.
Here is a good documentation for iOS SDK.
More granular detail is here
I hope that helps.
You may need to have an account with amazon aws in order to create your appID & all.

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Thanks you
To get the most up to date information to your users, you would need to use the API. If you want to store the data locally, you could do some initial scraping and build up your own database and distribute it within your app. This approach is not ideal because your data may become out of date quickly (unless you have a database update mechanism) and the owners of the sites you are scraping may not take too kindly on the matter

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