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

The Krotek

Adds Excerpt Length option on Reading page, which can be used to set the number of words in post excerpt.
FEATURES
<ul>
<li>Allows you to set custom excerpt length.</li>
<li>Will override the same filter in templates or other plugins (always works).</li>
</ul>
More information can be found on <a href="https://thekrotek.com/wordpress-extensions/miscellaneous" rel="nofollow ugc">extension’s page</a>.

Custom Excerpt Length

Adds Excerpt Length option on Reading page, which can be used to set the number of words in post excerpt.

BP Limit Activity Length vs Custom Excerpt Length