Send private messages and FB Graph Search

Hello every one!
Could you tell:
1) if there is an extension or programm sending private messages to friends?
2) - // - // - // - // - // - // - // - // - // - // - // - // - // - // - // - // other people?
3) how many messages and how often one can send them to friends and other people(for example, per day)? (Limits and delays)
4) how to scrape full list of UID from Graph Search? For example, "People who like the Matix" - arround 7 000 000 uid. But when I scrape them it finishes at 20k-25k max. Is there any extensions/programms or advice?
Thanks!