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 …

CJ Kruger

Bringing social engagement to Buddypress – let your community share to their hearts content all while promoting your website to social networks.
Buddypress Social adds Facebook, Twitter, Google+ and email sharing buttons to all your community’s activity – from member updates, group activity to media uploads.
Buddypress Social fits right with just about any wordpress theme as the plugin picks up your themes standard colors and adjusts the social buttons accordingly, however you may override the colors with the color pickers in the admin settings.
<h3>Notes</h3>
License.txt – contains the licensing details for this component.

BuddyPress Social

Bringing social engagement to Buddypress - let your community share to their hearts content all while promoting your website to social networks.

Buddypress Activity Anywhere vs BuddyPress Social