BuddyBoss

Let your BuddyPress members edit their activity posts and replies on the front-end of the site. You can even set a time limit for how long activity posts should remain editable.
Just activate the plugin, and every activity post and reply will become editable, styled automatically by BuddyPress to fit with your theme.

BuddyPress Edit Activity

BuddyPress Edit Activity allows your members to edit their activity posts on the front-end of your BuddyPress-powered site.

Adam Nowak

This plugin adds a customizable security question to the sign up form. You can choose your own question and answers. Multiple answers are possible, you can have a question like: Do you like cats or dogs and have both as acceptable answers. The goal is to fool the spam bots. Change questions as often as you need, it’s easy. The plugin can’t stop spam altogether, but every little bit helps.

Buddypress Humanity

This plugin adds a security question to the Buddypress registration page.

BuddyPress Edit Activity vs Buddypress Humanity