1) Five is the new ten.
2) All bloggers are obliged by blogging law to produce short lists of blatant truisms on a regular basis or face fines.
3) Readers are complicit: numerical lists get lots of reads, often more than other posts.
4) You must get to a clear number. Anywhere between three and twelve is the general rule. Five is by far the favourite. Who could concentrate further?
5) Social media means the pressure is on to write less and less: the ultimate destination may be “one thing about one thing”.
So perhaps twitter one liners are the future. Let us hope not. What would Samuel Pepys say?