Hostels are definitely the place for socializing. Since the guests in a hostel are mostly younger people, there are plenty of occasions to get to know other travellers. Some hostels organize parties, meetings or competitions, or have a bar within or just outside their premises where people can meet and chat to fellow guests.
Hostellers are generally more interested in meeting other people than your average tourist, so it's much easier to get in touch with them, share common interests and exchange advice, tips, etc. Many people travel on their own all over a country or continent more than a year long, and rely on chance meetings to make friends.
Below is the list of Hostels in Beşiktaş area :