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 …

Pranali Patel

Sanket Parmar

<a href="https://wordpress.org/plugins/buddypress/" rel="ugc">BuddyPress</a> plugin must be activated for this plugin.
BP Activity Share plugin is useful for sharing an activity locally like we are sharing any post in FaceBook: 
1. Share activity site-wide 
2. Share activity with custom text 
3. Share activity into any group in which user is a member
If you really like this plugin, don’t forget to rate -> https://wordpress.org/support/plugin/bp-activity-share/reviews#new-topic-0

BP Activity Share

Using BP Activity Share plugin you can share any activity locally like we share any post in FaceBook.

Buddypress Activity Anywhere vs BP Activity Share