Step 1:
Find somebody you trust to work with you as your partner. Your wife is a good choice, although in a pinch your pet hamster will suffice.
Step 2:
Create a dot.com company. Building a company with strong technical underpinnings and lead by a passionate and visionary leader is best. However, you can also cycle through e-<word>.com, choosing <word>'s from the dictionary until you find one which isn't used. Whatever.
If you find all the names are used, try the dictionary of a foreign language.
Step 3:
Go public! Issue 1,000,000,000 shares of stock. Keep 999,999,999 shares for yourself, and sell the other share.
Step 4:
Have your partner buy that share for $100.
Step 5:
Party!!!!! You now have a $100 billion market cap. Make sure you give interviews to Time, WSJ, and so forth. (If you don't understand why you have a $100 billion market cap, please close your AOL account and go back to your day job; this system isn't for you.)
Step 6:
Buy the company of your choice, using your $100 billion in stock. (Note: avoid companies created using this system.)
Step 7:
Retire. You've worked hard, and you deserve it.
(edit: source unknown, found on r.h.f a long time ago)
For Tencent (which makes WeChat), it's worth it to spend 0.03% of their market cap to partner with a fast growing app in the US market.