graph.facebook.com and FacebookConnect on iPhone: How can I remove a "like"

Question

I'm developing an iPhone application using the Facebook Connect APIs I arrived to set the "Like" on a post using the following code,

NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://graph.facebook.com/%@/likes", discussion.postId]]; ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url]; [request setPostValue:[self.facebook accessToken] forKey:@"access_token"]; [request setDelegate:self]; [request startAsynchronous];

it generates the following call:

HTTP POST https://graph.facebook.com/147512198609691_148877991806445/likes

but I'm not able to do the inverse operation "Unlike" (removing the like from the post) I tried the following

HTTP POST https://graph.facebook.com/147512198609691_148877991806445/likes?access_token=....&method=delete

and also

HTTP DELETE https://graph.facebook.com/147512198609691_148877991806445/likes?access_token=....

but those are not working, probably I'm using a wrong command

thank you for your help

HTTP