Background and challenges to implementation:
As part of the Brazilian Virtual Health Library (BVS) of Prevention and Cancer Control communication plan, it was launched a facebook fanpage in 2013. Social media was chosen because nowadays it is an essential strategy for spreading information in a fast and dynamic way. The objective was simply to disseminate the Library and attract more people to use it.

Intervention or response:
This case study shows that the BVS of Prevention and Cancer Control facebook fanpage became an important tool to engage partners to spread information about cancer and, specifically, tobacco control, since tobacco is one of its most current, and popular, subjects. Communication in health is about making people to acknowledge their role in promoting their own health and working in a collective way to promote healthy choices. Through the posts on the facebook fanpage it is possible to achieve these goals.

Results and lessons learnt:
The fanpage of the BVS has about 3500 "likes", which makes it the sixth of its kind on facebook. Our public is looking for information based on scientific evidence. So, it is a person that is interested in the general information on the tobacco control area but it is, also, a person that has some knowledge in the field. Each post on the BVS Prevention and Cancer Control facebook fanpage has about 600 engaged people. The ones about tobacco control reach as much as 2100 people.

Conclusions and key recommendations:
Social media is, nowadays, proved to be a communication tool very effective in engaging people on subjects as it has a wide range but with the possibility to direct the information to people who are willingly to search that subject. And, more important, in the case of the BVS of Prevention and Cancer Control fanpage, its posts are directed to people who work or research the area of cancer control.