I've finally made it to Level 32 on GS. On Level 31 I only leveled up around 3 or 4% aday. And now Level 32 can only be worse. I guess it's meant to be that way since with the exception of glitchy levels (Late teen levels, Level 20 etc.), each level is slower and slower.

And I'm only on Level 8 at TV.com. That's because I don't use that site nearly as much and the levels there are generally glitchy.