I 100% agree with You, about currently existing bookmark services. The "social" things like ranking, who got more bookmarks sounds especially pathetic and ridiculous...

Unfortunately, I have no clue about chromebook (don't use anything chrome related, and don't plan to). I also haven't used phpGmailDrive - I used GmailDrive (basic) some time ago, and I remember downloading new version every time I tried to upload/download my files, because old version was already non-working I used it as some kind of p2m, to share my bootlegs video recordings.

Unfortunately, You're talking to non-coder here (although I'm very interested in coding, and hope to get any skills sooner or later...), so, probably, You're much more skilled than me.

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As I said, I'm not coder, so i may be wrong, but it seems to me, that most time-effective thing You could do, is trying to write some small, but useful "bookmark site" - Honestly, I would use that myself. Even, if it ends up very niche, it seems more stable for future, than relying on non-standardized google bookmarks login. At least, there is no risk, that your work will be "wasted", when google change something. I agree, that writing Your own service for bookmarks may be more work (if You have not experience with it, otherwise, I agree that it should be simple), but You're 100% sure it's not going to be wiped out by other company decisions.

Sorry, for not being very helpful here

/Estel