for mutlu, it's a way to invite voters to come and see him.an: a lot of people who are active on social media -- whether it's facebook, instagram, or twitter -- see what i'm doing. they also see that i'm an approachable, accessible candidate, and that's really good. reporter: but, as a green party member of turkish origin, mutlu has also been subjected to a lot of hate posts. he's become a target for right-wing extremists and xenophobes. ozcan: social media has made it a lot easier to spread all this hatred. it was there among the people, but it was anonymous, hidden. reporter: mutlu is never far away from his smartphone -- or social media. before the first constituents stop by for a chat, he fits in another appointment. he rides to another district of berlin to talk about integration. here, mutlu also meets voters with turkish roots -- just like himself. but some of them have also attacked and threatened him on social media. ozcan: look what they wrote -- you vote stealer! i hope they feed your corpse to the dogs! don't come back to turkey ev