Creating a Twitter Api Key - Authenticating using OAuth 

Go to https://dev.twitter.com/apps/new and log in, if necessary

Supply the necessary required fields, accept the TOS, and solve the CAPTCHA.

Submit the form

Copy the consumer key (API key) and consumer secret from the screen into your application

If you also need the access token representing your own account's relationship with the application:

Ensure that your application is configured correctly with the permission level you need (read-only, read-write, read-write-with-direct messages).

On the application's detail page, invoke the "Your access token" feature to automatically negotiate the access token at the permission level you need.

Copy the indicated access token and access token secret from the screen into your application

Be sure and configure your application as needed before attempting the "your access token" step.

Setting Up X-Code Project

The Project fetches twitter feed without having to login. For this it uses the STTwitter Project on GitHub. Please refer to the project for more information on OAuth authentication.

Download the X-Code project from GitHub

Build the project. It will show few errors.

Open the TTwitterApiKey.h file.

Replace the Consumer key, Consumer Secret, OAuth Token, OAuth Token Secret, with the ones you generated.

1. Using Flickr apis require an OAuth token. Please follow the below steps to get an OAuth token.

Get yourself an OAuth token from OAuth Access Registration

Apply for a commercial / non-commercial key based on your need.

Fill the form and click submit.

Make a note of the generated access token. It will be something similar to "d002a0ef0a9ff9d7009d9689d646c882"

2. Clone and setup XCode project

Clone or download the XCode project from GitHub

Launch and build the project. It will show few errors. That is because we need to setup the OAuth token we previously generated.

Open URLConstants.h file and replace the text "your api key" with the OAuth token you previously generated.

Replace the text "your user name" with your flickr user id where you want to fetch the posts. It will be something similar to "99555817#N03"

Remove the #error directive from the lines above the api key and user name directives.

3. Build and Run.

4. You should now be able to see the list of all the Flickr Albums.

5. Selecting any album will launch the gallery.

6. The photo can also be shared by selecting the share button.

For more information on Flickr Apis, visit - http://www.flickr.com/services/api/

Using Tumblr apis require an OAuth token. Please follow the below steps to get an OAuth token.

Get yourself an OAuth token from OAuth Access Registration.

Click Register Application, fill the form and click register to generate an access token.

Make a note of the generated Access Token. It will be something similar to "abS8jX9828kc7hkx2Rm4T3My9eozbDoQgPPPCuFLXKIiWNYerL".

 2. Clone and setup XCode project

Clone or download the XCode project from GitHub 

Launch the project. If you try to build the project. It will show few errors. That is because we need to setup the OAuth token we previously generated.

c. Open URLConstants.h file and replace the text "your api key"with the OAuth token you previously generated.

Replace the text "blog name" with the name of the blog from where you want to fetch the posts.

Remove the #error directive from the lines above the api key and blog name directives.

3. Build and Run.

4. You should now be able to see the list of all posts.

5. You could also build a detail screen with the posts fetched.