So... everything would be perfect with that theme - as it was with World News II that I had before but after changing it to RockWall theres issue with link sharing in some social media and services. F.eg. now if i'm trying to share link on G+ - it gives me my page logo. When I'm looking in source code of my page there's no og:image tag so ... maby that is the reason of that (before everything it was ok).
The only thing that i've changed in last 2 weeks was your theme.
If you wanna check what is wrong my page is http://motionfreaks.pl/ and I'm using K2 for articles. I've read on this forum that it can be issue with K2- maby but as i've said - the only thing that was changed was template, and besides that RockWall is in section of themes that should be compatible with K2.