In today’s links roundup, the Online Fashion 100, video SEO, how Facebook handles half a billion users, and words to avoid in email subject lines… 

Search Engine Journal advises on the 8 Villains of social media; the users who make the social media marketer’s job more difficult. 

Leon Bailey Green has released this year’s Online Fashion 100; a list of the people that influence the online fashion business, including a mention for Econsultancy. 

A fascinating look at the software behind Facebook which helps the site serve up to half a billion users, 570 billion page views every month and the 3 billion photos that are uploaded every month, from Royal Pingdom. 

Search engines of the past, from Madatoms.

A technical guide to video SEO from Yoast.  

is Google launching a paid content service for newspapers? From the Guardian’s Greenslade Blog.  

19% of people in the UK used their phones to make a purchase in April, with 18-34 year olds driving the mobile commerce market. Some useful stats from the MMA, via Internet Retailing.  

From Digital Dialogue, the top 100 words NOT to use in email subject lines. 

And one from the Econsultancy archives…

How NOT to be The Social Media Guru