BuddyPress.org

For the people that are interested, here’s what I ended up doing.

function get_activity_flatline( $content ) {

$striptags = array("<p>", "</p>");

$content2 = str_replace($striptags, "", $content);

$content3 = substr($content2, 0, strpos($content2, '<span class="time-since">'));

return $content3;

}

add_filter( 'bp_get_activity_content', 'get_activity_flatline' );

Not pretty or anything, but it works for me. If you want the time to keep being displayed, change the <span class="time-since"> into

<blockquote>.