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 …

Maksym Marko

Add to the Buddypress Activity Plus plugin. This plugin adds CSS styles to images, videos and links. Also styling a THICKBOX.

Buddypress Activity Plus Styling

Additional CSS styles for the Buddypress Activity Plus plugin.

Buddypress Activity Anywhere vs Buddypress Activity Plus Styling