should i be worried about it and change my password or thats just some kind of a bs?
It's real, the database was hacked last year... If you haven't changed your password since then, it might be wise to do so now.
I find it a little weird you didn't know about this, it was the hot topic for weeks when it happened
They should be, since no data leak was reported for over a year.
this is indeed a good idear, be carefull tough: some users have the tendancy to look at the security log for password changes, and accuse people of using a bought account when they try to do business using an account that had a recently changed password... It's sad but true