Getting members from a Facebook Group or Fan Page

Sorry if this has been covered elsewhere, I am new here

I have a method which is very noobish which allowed me to get 80-90% of a groups page.

The method was to use graph API members connection and change the gid to the group i wanted info on. there is a limitation of around 500 fbid's and user name. At the time i could rerun it and it would generate another random 500. If i ran this 5 times the amount of the members of the group and i removed all duplicates i would get very close to the total amount of members of that group or fan page.

Facebook has done something and changed it so when i run the link it only give the last 500 that joined the group. for what I'm using it for all the important information is in the beginning members that joined the page

so my question is is there a way better way to get name and fbid's from a group or fan page?

and if 500 is the limit is there a way to processes multiple groups or fan pages. If I had a list of 100 gids, can I get a list of the last 500 users of all 100 groups as a batch process?

sorry if this is all noobish.

yes, you can get a bot or scraper coded to do this.

i just downloaded face-boom can you point me in the right direction for the scrapper code?

Yes You can do that.. No Problem with that and Pretty Safe too.