BuddyPress Rate Limit User Activity plugin allows BuddyPress site administrators to throttle the user activities on a BuddyPress based site. It will be a great help for all of you fighting with BuddyPress activity spams. Is your site suffering from spammers sending hundreds of activity updates/mentions and disturbing your otherwise good community.
Well, this plugin will solve your problems and let you enjoy your good time.
By using BuddyPress Rate Limit User Activity, you can limit the number of activity updates, comments a user can do, during a particular time interval.