Table Scheme Help

Hello fellow coders!

I'm hear looking at my table layout for vbspace, and have a question. The hack will have the ability for comments to be added to

1.) The users "space" page as user comments
2.) The users Blog page as comment for entries
3.) The users Galler Page for comments on pictures.

What would be the most logical and optimized way of the storing the comments?

1.)Having one table with is_gallery, is_blog, and is_space, fields to determine where they belong?

2.) Or seperate tables for each type of comment. (Ex. gcomments, scomments, bcomments)

I'm thinking the 2nd choice would be best, since the tables wouldn't contained redundant/null fields. But I could be wrong of course.

Any help will be greatly appreciated!