you can try uSocial.net. They will get you as many likes you want. All you need to do is purchase a package from the catalog. They will do the rest. But remember that you will get nothing except the number of likes to the page. If you want to show-off that you have many likes, then this will be helping you.
yes why not , you personally request on chat to your friends and friends of friends to like your posts. but i would personally suggest you not to follow black hat technique because Google will spam your FB id.
There are services you can pay to do this for you. Honestly I'm can't remember any off the top of my head. I'm sure fiverr has these on offer. Basically what they do is join websites where members of the site will like each other based on points. You can get more likes by buying points. Where the blackhat side comes in is someone creates bots that create the likes, or multiple facebook accounts. Others are real people. This is how they can get a lot of youtube views and twitter followers also.
You can easily get more face book likes within one month. Just invite others manually. Don't go for any Black hat SEO process. Try to post some interesting post always that will give some boost.
fiverr works out pretty well, you can get facbook likes, tweets, youtube likes/comments. almost anything social media related. its also low risk because if the contact doesn't come through for you it was on 5 bucks. but don't paypal dispute the contact or fiverr because the contact failed to deliver, they will ban your account. just contact them about it and they will reimburse you.