Lauren Uses Twitter to Market Her Hand-Painted

Lauren uses Twitter to market her hand-painted. She sets up a Twitter account with the name @uniquedesignsbylauren and posts this on her Facebook page, making sure to tweet every few days. Soon Lauren is selling a lot of scarves. Lauren's Twitter account is an example of

A) a microblog.
B) media sharing.
C) a corporate blog.
D) professional networking.
E) social bookmarking.