To advertise a busuu.com, I would take the logo and I'll put it in magazines, I would tell my friends and I would advise them to use this site and it speaks to their friends.
In the street, I would put big posters.
Thank you for your post. Let me make some corrections here, though:
1. "To advertise a busuu.com, I would take the logo and I'llwould put it ...". First, you don't need an article before the name of the website. And as to the verb form, since you are taking about a hypothetical action (not a real one), you should be using the word "would".
2. "It speaks to their friends" - did you mean to write "tell their friends about it"?
Hope to read more posts of yours in the coming days!
How would you advertise busuu.com?