The following in PLOS and in Nature is worth a read. Really. Namely:
In the first broad look at the behaviour of thousands of scientists on Twitter, researchers have found that women are better represented on the social-media site
 than on scientific papers. The team also noted that scientists tended 
to stick with researchers in their area of expertise while on the 
social-media site....“This is a really interesting finding,” ...says. Male scientists 
tend to have their papers cited more than female scientists, and there 
are more male full professors than female ones at US universities, she 
notes. So Twitter “may have more participation from women than we would 
expect”.
It may be interesting to follow. But just sit in any New York Restaurant and it is obvious.
