Asking for list of forums that change your signature for all posts

Hi, I have just seen a post with a great list of dofollow signatures. Is there a similar list for forums/blogs that will modify your signature for all previous posts on any given blog/forum? tks

 

Thats would be an interesting list... I am actually looking for a list of forums that DON'T modify your previous signatures... then you can just change your signature every few posts and gain links to as many different sites as you need.

 

Whats the default VB feature on that?

 

I know that phpbb has this function that when you change your signature that all your old posts change.