Reducing the size of MyPHP Database (EB Blog Revisions)

Hello SI Team

I have been told by my hoster. (Siteground)
That my database has exceeded the allowed size.
On my current plan I am only allowed 750MB.
They have given me until Friday to get this under control.

I have managed to enter the following database query in the phpMyAdmin section in the cPanel.

SELECT 

     table_schema as `fbug_NOT-REAL-NAME`, 

     table_name AS `Table`, 

     round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB` 

FROM information_schema.TABLES 

ORDER BY (data_length + index_length) DESC;

And got the following results:

finalbug_NOT-REAL-NAME fbug_easyblog_revisions 363.59
finalbug_NOT-REAL-NAME fbug_social_stream_item 102.53
finalbug_NOT-REAL-NAME fbug_social_mailer 96.76
finalbug_NOT-REAL-NAME fbug_finder_terms 55.44
finalbug_NOT-REAL-NAME fbug_social_notifications 24.36
finalbug_NOT-REAL-NAME fbug_finder_links 16.17
finalbug_NOT-REAL-NAME fbug_finder_links_terms8 9.08
finalbug_NOT-REAL-NAME fbug_finder_links_terms0 7.09
finalbug_NOT-REAL-NAME fbug_finder_links_termse 7.08
finalbug_NOT-REAL-NAME fbug_finder_links_terms4 5.14
finalbug_NOT-REAL-NAME fbug_social_points_history 4.43
finalbug_NOT-REAL-NAME fbug_social_privacy_items 4.21
finalbug_NOT-REAL-NAME fbug_social_stream 3.88
finalbug_NOT-REAL-NAME fbug_admintools_filescache 3.52
finalbug_NOT-REAL-NAME fbug_easyblog_post 3.44
finalbug_NOT-REAL-NAME fbug_social_fields_data 3.12

It looks as of Blog revisions alone are taking up to almost half of the allowed data base!
(Currently @ 759MB)
Is there any way I can reduce this number.
Split it up into another data base.

Do some thing to get comfortably under my allowed 750MB for my current plan.

Real database name and login details are included in the "Additional Message" info section below.

thanks in advance

Paul