My cellphone (Android, HTC J-One) started giving me the following error every time I tried to follow a link to an external site from the official Facebook app.
Something went wrong
Sorry but there was a problem with this link
[insert link here]
You can now continue to this website or go back to the page you were on before. Remember: Only follow links from sources you trust.
I found out that the reason this happened was because I was not logged in to Facebook in my browser. The links in FB are often masked with a different address that includes the FB domain and by jumping from the app to the browser (where I wasn’t logged in), Facebook somehow thought someone was up to no good. Once I opened my browser and logged in there, I could click on links in the FB app and be taken to them without this error popping up.
Some sites will mention that deleting the Facebook Pages app will fix this problem. It didn’t in my case.