Mike Martel

BP Limit Activity Length is a simple plugin that forces users to keep the length of their activity updates limited by amount of characters or words.
The plugin adds a character/word countdown next to the Post Update button, and prevents users from typing further than the specified limit. Only new activities will be truncated to the set amount of characters or words
The amount of characters is a simple setting in the BuddyPress administration screens.

BP Limit Activity Length

Even after not being updated in 5 years, this plugin still works!

This plugin still works

Limit the length of your BuddyPress activity updates like Twitter

Ashkar

Adds an Excerpt Length field setting to the Reading Settings section of your WordPress dashboard. This setting allows you to specify the number of words that you want to display in the <code><a href="https://codex.wordpress.org/Template_Tags/the_excerpt" rel="external">the_excerpt()</a></code> function.

Change Excerpt Length

Allows users to change the excerpt length from the WordPress Reading Settings page.

BP Limit Activity Length vs Change Excerpt Length