how does apps like snapchat and instagram detect facial expressions on their filters? - project

I have an upcoming project regarding FER(facial expression recognition),yet I have no clue regarding where to start with this project despite searching about these apps like snapchat and insta where I wasnt able to find their API

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How would I make my own feed/marketplace? [React Native]

I am so curious about how companies make their own marketplace within an application? I am trying to achieve a marketplace where individuals can sell products on a mobile application. So when a user logs into the app they are met with a live feed of various products. Something similar to the GOAT app, eBay, or Etsy. Usually, I know where to start, however, I have never dealt with an idea so complex. I know it can be done because it has been done multiple times over. However, I am asking if someone could provide me with some guidance. I did some Googling but came out empty-handed. Is there a video tutorial or a step-by-step guide on something like this? I also do not mind buying a course if I can achieve this effect!
Currently, what I have now are three pages! A working signup and login screen with a firebase backend that authenticates a user's email and password. It leads to my home page which is very basic. Just a header with tab navigation! I know it is very barebones... however I came here to see if I can be provided with some steps from here. Maybe even a proper technology stack.
Thank you in advance for any help!
Here are some examples of apps with live marketplaces:
https://appsftw.com/app/looklive-shopping-app-discover-celebrity-fashion
https://itunes.apple.com/us/app/shop-sell-save-with-ebay/id282614216?mt=8
https://itunes.apple.com/us/app/goat-shop-sneakers/id966758561?mt=8
Hey research marketplaces with ready app react-native template like this template e-commerce . But you need some knowledge about react-native or you can ask a freelancers.

How to tag a product from an Instagram photo to an Ecommerce?

Please take a look on this screenshot.
I want to do the same: tagging products that appear in my Instagram pics and link them to an Ecommerce website.
I tried to find Instagram tools to do that, but I can't seem to find them natively. Is that some premium feature, or how can I tag my products like that?
This should answer as to why you can't see the feature. https://www.facebook.com/business/help/719199648241244. Also, if your E-Commerce website is WordPress, there may be a free plugin (not sure which one to recommend as there are several) that can take your WooCommerce and feed it to both Facebook and Google Merchant. Make sure you setup a Business Instagram from your personal instagram ideally using your mobile phone and create a business page on FB. Keep in mind you will only see metrics from Instagram AFTER you setup your business Insta acct. and not for previous posts already on Insta.

Rally API: where can I find DETAILS on EXACTLY what is available?

I have been tasked with creating an internal app that interfaces the Rally API to do various 'legwork' for a speedier day around the office.
I am frustrated because I cannot find documentation on exactly what is available and how to use it. I am scraping and scraping away on different sites, google, etc just to find stuff like 'hierarchicalrequirement' is actually UserStory. so, it seems to me that Rally really doesn't WANT anyone to use their API... quite frustrating.
Their documentation says things like toCreate["Workspace"] = ('1234567')
where it's actually toCreate["Workspace"] = /workspace/1234567
I need an enumeration of what's available and what they're actually named.
It looks like you are trying to use one of their SDKs. Their documentation for their REST API can be found here.
https://rally1.rallydev.com/slm/doc/webservice/
Also, here is the link to their app API,
https://help.rallydev.com/apps/2.0/doc/#
And their lookback API
https://rally1.rallydev.com/analytics/doc/#/manual
And if you want documentation to a specific language SDK, you can look at Github.

Google Commerce Search for a standalone app?

I am building a mobile app.
I am not merchant, I am just an app developer.
I want to integrate some of google's search abilities, and so I have stumbled upon Google Commerce Search. Its features seem to cover the exact features I am looking for.
However, it seems as though it's only meant for retailers, and the pricing is accordingly.
So my questions are:
Is there any way to integrate Google's product or commerce search through an publicly open
api?
Is there any way to integrate some image search as well (find similar images)?
Thank you.

Facebook Integration with an external site

Hii..
I am working on developing a website and I want it to be integrated with Facebook, i.e. I want to fetch logged-in user's information like his wall info, comments, his feeds etc. along with his friends's information,their comments etc..
Also I want user of my website to be able to post comments, feeds on his wall, update / upload picture etc.
And all that I want to do using facebook API..
Is there any way to do it..? Please help me out, I am really not getting the way that how to do it..
Yes this all possible, but your question is too vague to have definite answer.
First you need to learn about:
Social plugins
Javascript SDK
Authentication (see Single Sign-on with the JavaScript SDK)
FQL
If after that you still have some specific questions we would be able to help further.
I'm not sure what languages/technology stacks you may be considering for your site, but you could also check for plugins that interface w/ the fb API such as
Facebooker - Rails plugin
Facebook Graph Plugin - Grails plugin