2nd exercise: Everyone follow @a16z and the entire team at Andreesen Horowitz:
@pmarca, @bhorowitz,@cdixon, @w_scottweiss, @jeff_jordan,@peter_levine, @LarsLuv, @balajis.
The team writes a lot of interesting things on Twitter ranging from macroeconomics to tracking smart phone growth and market shares to robots in a future when human labor is not needed for us to survive.
If you follow @a16z, please consider mentioning “@charlesjo says to follow you @a16z.” 
It’s a personal project on social networking and community growth.
(Of course, all welcome to follow me too @charlesjo).
Next exercise coming up soon. Feedback always welcome!
Charles