Weiner needed a more private channel of communication for flirtations up to and including pictures of his package. Since the women followed him already, he could send them direct messages. But to receive their replies, he had to follow them in return. Only then could he engage in flirting or sexual repartee.
Weiner seemed not to realize the extent to which Twitter’s rules still made him vulnerable. The women were publicly listed among those accounts he followed. Since he only followed around 200 people, these new followers seemed out of place among the politicians, journalists, and celebrities on his list. It was all too easy for a political foe to notice that Weiner was adding young women (and in at least one case, a porn star) to his followers soon after a public exchange.’
[twitter] How Decisions Made by Twitter Founders in 2006 Led to Anthony Weiner’s Dickish Demise … Steven Levy looks at how design decisions and Anthony Weiner’s reckless use of Twitter led to his downfall …