Hello Fred,

We don't actually have a tool to wipe out data as we are afraid users may accidentally use it without understanding it. You can however run the following queries if you need to clear the database,

[gist]
truncate table #__social_access_logs;
truncate table #__social_albums;
truncate table #__social_albums_favourite;
truncate table #__social_stream;
truncate table #__social_stream_item;
truncate table #__social_comments;
truncate table #__social_likes;
truncate table #__social_avatars;
truncate table #__social_badges_history;
truncate table #__social_badges_maps;
truncate table #__social_block_users;
truncate table #__social_bookmarks;
truncate table #__social_broadcasts;
truncate table #__social_clusters_news;
truncate table #__social_clusters_reject;
truncate table #__social_conversations;
truncate table #__social_conversations_message;
truncate table #__social_conversations_message_maps;
truncate table #__social_conversations_participants;
truncate table #__social_covers;
truncate table #__social_discussions;
truncate table #__social_discussions_files;
truncate table #__social_feeds;
truncate table #__social_files;
truncate table #__social_files_collections;
truncate table #__social_friends;
truncate table #__social_friends_invitations;
truncate table #__social_links;
truncate table #__social_lists;
truncate table #__social_lists_maps;
truncate table #__social_logger;
truncate table #__social_mailer;
truncate table #__social_moods;
truncate table #__social_notes;
truncate table #__social_notifications;
truncate table #__social_notifications_browser;
truncate table #__social_oauth_history;
truncate table #__social_photos;
truncate table #__social_photos_meta;
truncate table #__social_photos_tag;
truncate table #__social_points_history;
[/gist]

Replace #__ with the appropriate prefix