Activity Stream builds a lifestream for you by aggregating your social activities all in one place. 

Twitter,FlickrFacebook,Digg,Delicious,YouTube and more

Download module,

Http://drupal.org/project/activitystream 

and install into ../sites/all/modules

once installed then activate it.

Admin/sitebuildsing/modules/activitystream,  activate all modules and save

configurations. 

goto site configuration. and install username and password 

• Configure the stream's title
• Configure Username and Rss Feeds.
• Refresh Cron.php
• Add the activity screen in a block

Advance uses

In order to get better control of OG details Block. For example

To hide "invite Friend"

Change a string where it sayd Group to Classes

Uploading large files via filefields.

You need to changed the memory limit in php.ini and modify the drupal root .htaccess file to permit this

The start of the .htaccess file now looks like this. 

php_value post_max_size 51m
php_value max_input_time 2680
php_value upload_max_filesize 50m
php_value upload_tmp_dir /tmp
php_value memory_limit 110m

additional settings in php.ini 

max_execution_time,

max_input_time,

post_max_size,

memory_limit

1.  Download the latest release from drupal.org
2. Save the release to a directory on your harddrive
3. unzip the download.
4. download wampserver at www.wampserver.com to install Apache, MySQL, PHP on windows and install on your local machine.
5. After you installed wampserver you should have an icon on your desktop.
6. Ensure Wampserver is online
7. goto phpmyadmin. Create a database
8. drop the drupal directory into your www directory
9. Goto Apache modules. make sure the rewrite modules is checked. to allow cleanr urls
10. from explorer http:/localhost/drupal
11. now install drupal
12. insert the database name. 
13. Configure drupal and install.

 So, if you want an iPhone-enabled version of your Drupal website, all you have to do is install the http://drupal.org/project/iui   iUI Drupal Theme, and then switch to the iUI theme when the user visits your mobile-enabled website. You could do that by either a small hack in settings.php, or one of the many modules out there that changes the theme based on the user agent or the domain. 

A client of mine had an issue with PayPal checkout option not working correctly. Site with eCmmerce 5.x-3.3, This was working correctly before. The issue was when a customer were sent to PayPal.com they were not presented with an option to pay via credit card. They are forced to login or create a PayPal account. My guess is that the field "PayPal processing URL:" needs to be changed. Which it turn out to be pointing to an incorrect URL.  The answer was to  go to https://www.paypal.com/xclick/