Effi is application development framework.
is the publisher, writer, and vocalist (artist name Effi) of the song Sweet Dreams on the Ultra Dance 03 album.
Mattes was featured in four films directed by director Rainer Werner Fassbinder (The Bitter Tears of Petra von Kant, Wildwechsel, Effi Briest and In a Year of 13 Moons).
Electronic Frontier Finland (EFFI) have noticed that the blacklist includes non-pornographic websites also, including a Windows advice forum, a computer repair service and the Internet Initiative Japan server nn.iij4u.or.jp that, among others, hosts websites for a violin factory, a doll store and a hearing aid manufacturer.