Yahoo and Six Apart, creator of Movable Type–the most popular software used to create professional blogs–said on Sunday Yahoo will be the preferred supplier of Movable Type for small businesses. The partnership is the latest in a string of deals as Yahoo seeks to embrace so-called “social media,” the new generation of Web sites that encourage Internet users to share written text, photos, and videos. On Friday, Yahoo acquired Del.icio.us, a site for users to share their favorite Web links. Earlier this year, it acquired Flickr, which offers a way to annotate and share photos.