Eyal Fitoussi

This is a simple that adds an activity button to the admin toolbar in the fron-end. Once a user (logged in) clicks on the button the activity form will pop up. The form will have a text area for the user to enter anything he want to post in his activity. 
When the user submit the form the plugin will post the info to his activity stream.
Checkout the <a href="http://codecanyon.net/item/buddypress-quick-activity/7112239" rel="nofollow ugc">premium version</a> for extra features

Buddypress Activity Anywhere

Let the members of your site post an update to their activity stream from anywhere in your site or any other subsite in a multisite installation inste …

BuddyDev

Brajesh Singh

BuddyPress Activity Comment Notifier plugin emulates the facebook style notification for the comments made on user activity. It will show the notification to a user in following scenario
<ul>
<li>When a user has an update and someone else comments on it(It is handled by BuddyPress Now)</li>
<li>When a user comments on someone’s update and other users also comment on that update, all the users are notified</li>
<li>When a user favorites your activity</li>
</ul>
For more details, please visit <a href="http://buddydev.com/plugins/buddypress-activity-comment-notifier/" title="Plugin page" rel="nofollow ugc">BuddyPress Activity Comment Notifier plugin page</a>
Free & paid supports are available via <a href="http://buddydev.com/support/forums/" title="BuddyDev support forums" rel="nofollow ugc">BuddyDev Support Forum</a>

BuddyPress Activity Comment Notifier

BuddyPress Activity Comment Notifier plugin emulates the facebook style notification for the comments made on user activity.

Buddypress Activity Anywhere vs BuddyPress Activity Comment Notifier