How to start a conversation with a girl on facebook?

[Cash rulez]

Hi i graduated from high school in 2005 and this girl i had a crush on graduated in 07
i use to see her in the halls sometimes,but i couldnt man up...so long story short
i jus seen her a couple of months ago were she works at a local
market and i was shocked to see her.
i didnt speak to her or i dont know if she noticed me in high school or at the market.
i found her facebook page. and she has some of my old friends as her friends on her friends list.

i would really like to know what to do next.
i havent seen her in the market for a while but at the same time i dont want to feel
like im stalkin her. facebook is the only way..

do you guys think my first initiation is to friend request her and give her a poke on facebook or should i wait till i see her again and ask if we had met before or wateva...what i didnt mention before is that when we went to high school i use to see her in the hall way, but didnt say a damn thing to her to be honest im still scared of rejection .. i just wanna get to know her thats
it for now...

[Incognito]

Have an actual conversation at the market

[Cait]

Yess! Talk to her, ask her what she's been up to. Life is to short to waste time

[Chris]

Seeing her in person is much better. Go up and start talking with her to see if she remembers you. After a short talk ask her if she is single. If yes, then say "Great. What's your number." She will give it to you if she said that she is single.

If you want to learn some shortcuts on how to meet girls then watch this video here http://www.manmeetsgirl.com/the-tao-of-badass-review (Click on one of the images on that article to get to the video.)