Hackers

I'm not good with computers but I believe my android phone got hacked just recently. What damage can I expect if clicking on a videolink in fb that is planted by a hacker?
Do I need to do a factory re-installation of my entire phone in order to get rid of this evil?
If so - how do I save the following in such a way that it can be re-installed later the same way it is now?
- My google calendar posts
- My saved bookmarks

Is there some way to see/screen if my phone really is hacked?

 

It is unlikely that your phone is hacked, but it is always good to check if your data got a backup in case you need to reset your phone, if it breaks or get lost.

The Google Calendar app should be synched to Google Calendar. Browse to https://calendar.google.com and check that everything is synched. Also check that everything is synching on your phone. Settings->Accounts->Google and then click your Google account.
If you are using Chrome and are logged in then your bookmarks should also be synched. Open Chrome on a computer and see if your bookmarks are there.

If it is synched then you just have to login with your Google account to restore everything after a reset.