Outside the vanity group, the only people likely to pay for this are the people who have somebody else paying for it - a corporate or government employer - or who can write it off personally as a cost of business.

While nice to think that every comment I make to a tweet is read by the original tweeter, at the end of the day I honestly am not heartbroken if they do not.

And I most definitely do not reply to tweets with the idea that others will be so amazed by my brilliance that they follow me. Is that really a thing?