According to this infographic they are 
Embed the above image on your site
Direct Link
via 
- @Shareaholic'; SHR_config['link'] = 'http://businessontwitter.co.uk/twitter/2011/08/are-twitter-users-braver-than-facebook-users/'; SHR_config['title'] = 'Are+Twitter+users+braver+than+Facebook+users%3F'; SHR_config['short_link'] = ''; if(!window.SHR || !window.SHR.Servicelet) { var d = document; var s=d.createElement('script'); s.setAttribute('language','javascript'); s.id='shr-servicelet'; s.setAttribute('src', 'http://www.shareaholic.com' + '/media/js/servicelet.js'); d.body.appendChild(s); } else{ SHR.Servicelet.show(); } return false; ">
Other posts you may be interested in:
- How advertising has progressed on Twitter
- The four stages of ‘getting’ Twitter
- Twitter: Following More Than 150 People? Big Head!
- Twitter: Is It Time To Shoot The Messenger?
- My hashtag is better than yours
- The London Riots and Twitter
- How to create your own Twitter infographic
- Who said you cannot get Business from Twitter, A guest blog from Mark Shaw
- Twitter real time search no longer in Google results?
- Twitter, injunctions and the fine art of misdirection
I wouldn’t call it brave, I would call it trying to gain popularity by asking for it instead of gaining a following organically by creating good content. It’s a negative thing, not a positive one… and it’s irritating and spam-y.